Dr. Gopalakrishnarao Parthasarathy

Senior Scientist
CSIR-National Geophysical Research Institute, India

Highest Degree
PostDoc Fellow in Earth Sciences from Cornell University, USA

My URL
https://livedna.org/91.11551

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Biography

Dr. Gopalakrishnarao Parthasarathy is currently working as Chief Scientist at CSIR- National Geophysical Research Institute, Hyderabad, A.P. India. He has completed his PhD in Physics from Indian Institute of Science, Bangalore and Post-Doc Research work at University of Paderborn, Germany. Dr. Parthasarathy has initiated Mineral Geophysics program and Nanogeoscience research in India. His several seminal contributions in this area are with indigenously developed instruments coupled with modern spectroscopic tools. His structural and thermodynamic study of wide range of Earth and Planetary materials yielded many significant and nontrivial results, also have led to the discovery of several Rare Minerals, many for the first time from India, like Moganite, Calumetite, Geikielite, Zemkorite, Fullerenes, and Ferrous Saponite. Each of the findings has been used to constrain the understanding of geological processes responsible for their formation such as Mantle Metasomatism beneath the Wajrakarur Diamond Bearing Province, Bolide-Impact Processes during the Cretaceous-Palaeogene Boundary, and Fluid Rock Interactions beneath the Deccan Trap, Peak Metamorphic P-T- conditions of the Gondwanaland, etc. He studied mineralogical aspects of several meteorites that fell in India during the past decades. His studies were useful in unambiguous classification of the meteorites. He has been involved in studying the terrestrial analogues minerals relevant to the Lunar and Mars Science. He developed an innovative method of converting water soluble Carcinogenic Hexavalent Chromium to water insoluble less Toxic Trivalent Chromium by using naturally occurring ferrous Saponite discovered by him in Deccan Basalts. He has been involved in Innovative and cost effective developmental research in the area of Applied Mineralogy since three decades. He is life fellow of Indian Physical Society, Geological Society of India, Indian Geophysical Union, Mineralogical Society of India, life member of American Nano Society. Dr. Parthasarathy received honors includes PRL-Award in Earth and Planetary sciences, for the year 2003, PRL, Department of Space, Government of India, National Mineral Award in the field of Geology, A.P. Scientist Award- 2007, in Physical Sciences, Andhra Pradesh Council of Science and Technology and Geological Society of India M.R. Srinivasa Rao Award for Experimental Mineralogy and Petrology. He is member of editorial board in number of journals. He has published research articles in journals contributed as author/co-author.

Area of Interest:

Earth Science and Geography
Mineral Geophysics
Nanogeoscience Research
Fluid Rock Interactions
Lunar Science

Selected Publications

  1. Chandra, U., P. Sharma, G. Parthasarathy, B. Sreedhar, 2016. Behavioral response of pyrite structured Co0.2Fe0.8S2 nano-wires under high-pressure up to 8 GPa - Mossbauer spectroscopic and electrical resistivity studies. J. Phys. Chem. Solids, 89: 107-114.
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  2. Saikia, B.J., G. Parthasarathy, Parthasarathy and R.R. Borah, 2015. Distribution of Microcrystalline Quartz in Glassy Fulgurites from Garuamukh and Kimin, India. J. Appl. Math. Phys., 3: 1343-1351.
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  3. Parthasarathy, G. and M. Santosh, 2015. Pressure Induced Polymorphic Phase Transition of Natural Metamorphic Kalsilite; Electrical Resistivity and Infrared Spectroscopic Investigations. Miner., 5: 647-653.
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  4. Chandra, U., K.K. Pandey, G. Parthasarathy and S.M. Sharma, 2015. High-pressure investigations on Piplia Kalan eucrite meteorite using in-situ X-ray diffraction and 57Fe Mossbauer spectroscopic technique up to 16 GPa. Geosci. Front., 10.1016/j.gsf.2015.05.003.
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  5. Pandey, O.P., P. Tripathi, G. Parthasarathy, V. Rajagopalan and B. Sreedhar, 2014. Geochemical and mineralogical studies of chlorine-rich amphibole and biotite from the 2.5 Ga mid-crustal basement beneath the 1993 Killari earthquake region, Maharashtra: Evidence for mantle metasomatism beneath the Deccan Trap. J. Geol. Soc. India, 83: 599-612.
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  6. Chandra, U., I. Zuburtikudis, G. Parthasarathy and B. Sreedhar, 2014. High-pressure electrical resistivity and Mossbauer spectroscopic studies on narrow band Co0.8Fe0.2S2 nanoparticles up to 8 GPa. Phase Transitions, 87: 477-490.
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  7. Agarwal, V., G. Parthasarathy, M.S. Sisodia and N. Bhandari, 2014. Fall, mineralogy and chemistry of Nathdwara H6 chondrite. Geosci. Front., 5: 413-417.
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  8. Gangwar, P., M. Pandey, S. Sivakumar, R.G.S. Pala and G. Parthasarathy, 2013. Increased Loading of Eu3+ Ions in Monazite LaVO4 Nanocrystals via Pressure-Driven Phase Transitions. Cryst. Growth Des., 13: 2344-2349.
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  9. Tripathi, P., G. Parthasarathy, S.M. Ahmad and O.P. Pandey, 2012. Mantle-derived fluids in the basement of the Deccan Trap: evidence from stable carbon and oxygen isotopes of carbonates from the Killari borehole basement, Maharashtra, India. Int. J. Earth Sci., 101: 1385-1395.
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  10. Parthasarathy, G., 2011. Mathematical Analysis of Gravity Anomalies: Concepts, Algorithms and Computer Programs by V. Chakravarthi. In: Journal of the Geological Society of India. Parthasarathy, G. (Ed.). Lambert Academic Publishing GmbH & Co. KG, Germany, ISSN: 0016-7622, pp 197-199.
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  11. Parthasarathy, G., 2011. Electrical properties of natural and synthetic nano-crystalline MgTiO3 geikielite at mantle pressure and temperature conditions. Am. Mineral., 96: 860-863.
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  12. Parthasarathy, G. and B. Sreedhar, 2011. Researches in Nanogeoscience and their relevance to the Planetary Shallow subsurface science. Nano Digest, 3: 14-17.

  13. Parthasarathy, G. and B. Sreedhar, 2011. Pressure dependence of the electrical resistivity of natural cassiterite SnO2 and of undoped and Co-doped nanocrystalline SnO2. Philos. Mag. Lett., 91: 200-206.
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  14. Kumar, G.N., G. Parthasarathy and J.L. Rao, 2011. Low-temperature electron paramagnetic resonance studies on natural calumetite from Khetri copper mine, Rajasthan, India. Am. Mineral., 96: 654-658.
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  15. Chandra, U., P. Sharma and G. Parthasarathy, 2011. High-pressure electrical resistivity, Mossbauer, thermal analysis, and micro-Raman spectroscopic investigations on microwave synthesized orthorhombic cubanite (CuFe2S3). Chem. Geol., 284: 211-216.
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  16. Arundhathi, R., B. Sreedhar and G. Parthasarathy, 2011. Highly efficient heterogenous catalyst for O-arylation of phenols with aryl halides using natural ferrous chamosite. Appl. Clay Sci., 51: 131-137.
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  17. Saikia, B.J. and G. Parthasarathy, 2010. Fourier Transform Infrared Spectroscopic Characterization of Kaolinite from Assam and Meghalaya, Northeastern India. J. Mod. Phys., 1: 206-210.
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  18. Kumar, G.H., G. Parthasarathy, R.P.S. Chakradhar, J.L. Rao and Y.C. Ratnakaram, 2010. Temperature dependence on the electron paramagnetic resonance spectra of natural jasper from Taroko Gorge (Taiwan). Phys. Chem. Miner., 37: 201-208.
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  19. Chandra, U., P. Sharma, G. Parthasarathy and B. Sreedhar, 2010. 57Fe Mossbauer spectroscopy and electrical resistivity studies on naturally occurring native iron under high pressures up to 9.1 GPa. Am. Mineral., 95: 870-875.
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  20. Chandra, U., G. Parthasarathy and P. Sharma, 2010. Synthetic Cubanite CuFe2S3: pressure-induced transformation to isocubanite. Can. Mineral., 48: 1137-1147.
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  21. Arundhathi, R., B. Sreedhar and G. Parthasarathy, 2010. Chamosite, a naturally occurring clay as a versatile catalyst for various organic transformations. Clay Miner., 45: 281-299.
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  22. Sreedhar, B., R. Arundhathi, M.A. Reddy and G. Parthasarathy, 2009. Highly efficient heterogenous catalyst for acylation of alcohols and amines using natural ferrous chamosite. Appl. Clay Sci., 43: 425-434.
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  23. Saikia, B.J., G. Parthasarathy and N.C. Sarmah, 2009. Spectroscopic Characterization of Olivine [(Fe, Mg)2 SiO4] in Madadevpur H4/5 or dinary chondrite. J. Am. Sci., 5: 71-78.
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  24. Saikia, B.J., G. Parthasarathy and N.C. Sarmah, 2009. Fourier transform infrared spectroscopic characterization of Dergaon H5 chondrite: evidence of aliphatic organic compound. Nat. Sci., 7: 45-51.

  25. Pandey, O.P., K. Chandrakala, G. Parthasarathy, P.R. Reddy and G.K. Reddy, 2009. Upwarped high velocity mafic crust, subsurface tectonics and causes of intraplate Latur-Killari (M 6.2) and Koyna (M 6.3) earthquakes, India – A comparative study. J. Asian Earth Sci., 34: 781-795.
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  26. Hemanthkumar, G.N., G. Parthasarathy, R.P.S. Chakradhar, I. Omkaram, J.L. Rao and Y.C. Ratnakaram, 2009. Electron paramagnetic resonance studies on clinochlore from Longitudinal Valley area, northeastern Taiwan. Phys. Chem. Miner., 36: 447-453.
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  27. Bhandari, N., S.V.S. Murty, R.R. Mahajan, G. Parthasarathy, P.N. Shukla, M.S. Sisodia and V.K. Rai, 2009. Kaprada L(5/6) chondrite: Chemistry, petrography, noble gases and nuclear tracks. Planet. Space Sci., 57: 2048-2052.
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  28. Saikia, B.J., G. Parthasarathy, N.C. Sarmah and G.D. Baruah, 2008. Fourier-transform infrared spectroscopic characterization of naturally occurring glassy fulgurites. Bull. Mater. Sci., 31: 155-158.
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  29. Saikia, B.J., G. Parthasarathy and N.C. Sarmah, 2008. Fourier transform infrared spectroscopic estimation of crystallinity in SiO2 based rocks. Bull. Mater. Sci., 31: 775-779.
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  30. Parthasarathy, G., N. Bhandari, M. Vairamani and A.C. Kunwar, 2008. High-pressure phase of natural fullerene C60 in iridium-rich Cretaceous-Tertiary boundary layers of Deccan intertrappean deposits, Anjar, Kutch, India. Geochim. Cosmochim. Acta, 72: 978-987.
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  31. Parthasarathy, G., 2008. Experimental Mineralogy and nano-geoscience. In: Glimpses of Geoscience Research in India. Singhvi, A.K., A. Bhattacharya and S. Guha (Eds.). Indian National Science Academy, New Delhi, India, pp 213-217.

  32. Misra, K.S., M.R. Hammond, A.V. Phadke, F. Plows and U.S.N. Reddy et al., 2008. Occurrence of Fullerene Bearing Shungite Suite in Mangampeta Area, Cuddapah District, Andhra Pradesh. J. Geol. Soc. India, 71: 590-591.
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  33. Dilawar, N., U. Chandra, G. Parthasarathy and A.K. Bandyopadhyay, 2008. Study of high-pressure-induced phase transition in nanocrystalline perovskite (LaSr)(MnFe)O3by Raman spectroscopy. J. Raman Spectrosc., 39: 1765-1771.
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  34. Bhandari, N., S.V.S. Murty, P.N. Shukla, R.R. Mahajan and A.D. Shukla et al., 2008. Ararki (L5) chondrite: the first meteorite find in Thar desert of India. Meteorit. Planet. Sci., 43: 761-770.
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  35. Sharma, S.R., G. Parthasarathy and A.K. Arora, 2007. Evaluation Of Peak Metamorphic Temperatures Using Spectroscopic Studies On Carbonaceous Matter Extracted From The Earth And Planetary Materials. Indian Mineral., 41: 1-17.

  36. Parthasarthy, G., R. Srinivasan, G.D. Mukherjee, C. Bansal and A. Chatterjee, 2007. Thermal expansion study of a uvarovite rich garnet. Int. J. Mod. Phys. B, 21: 1915-1922.
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  37. Parthasarathy, G., B.M. Choudary, B. Sreedhar and A.C. Kunwar, 2007. Environmental mineralogy: spectroscopic studies on ferrous saponite and the reduction of hexavalent chromium. Nat. Hazards, 40: 647-655.
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  38. Parthasarathy, G., A.S. Collins and T.R.K. Chetty, 2007. , Discussion on Natural Graphite from Inanalo Mountain, Southern Madagascar. J. Geol. Soc. India, 69: 865-866.

  39. Parthasarathy, G., 2007. High-temperature electrical resistivity and heat capacity studies on nano-crystalline geikielite. Mater. Lett., 61: 3208-3210.
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  40. Parthasarathy, G., 2007. Electrical resistivity of nano-crystalline and natural MgTiO3−geikielite at high-pressures up to 8 GPa. Mater. Lett., 61: 4329-4331.
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  41. Parthasarathy, G. and S.V. Manorama, 2007. A novel method for synthesizing nano-crystalline MgTiO3 geikielite. Bull. Mater. Sci., 30: 19-21.
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  42. Misra, K.S., M.R. Hammond, A.V. Phadke, F. Plows and U.S.N. Reddy et al., 2007. Occurrence of Fullerene bearing Shungite Suite Roack in Mangampeta Area, Cuddapah District, Andhra Pradesh. J. Geol. Soc. India, 69: 25-28.

  43. Parthasarathy, G., B. Sreedhar and T.R.K. Chetty, 2006. Spectroscopic and X-ray diffraction studies on fluid deposited rhombohedral graphite from the Eastern Ghats Mobile Belt, India. Curr. Sci., 90: 995-1000.
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  44. Parthasarathy, G., 2006. Zeolite zonation and amygdaloidal minerals from the Killari borehole of Deccan traps, Maharashtra, India. J. Appl. Geochem., 8: 546-557.

  45. Parthasarathy, G., 2006. Effect of high-pressures on the electrical resistivity of natural zeolites from Deccan Trap, Maharashtra, India. J. Appl. Geophys., 58: 321-329.
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  46. Parhasarathy, G., A. Collins, T. Chetty, 2006. Natural graphite from neoproterozoic psammitic gneiss, Inanalo mountain, southern Madagascar. J. Geol. Soc. India, 68: 176-180.

  47. Kumar, M., U. Chandra and G. Parthasarathy, 2006. High pressure electrical resistivity behaviour on nano-crystalline vacancy doped perovskite manganites. Mater. Lett., 60: 2066-2068.
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  48. Tiwari, L.B., C.J. Jahagirdar, V.D. Deshpande, R. Srinivasan, and G. Parthasarathy, 2005. Weathering impact on the colour of building stones of the ‘Gateway of India’ monument. Environ. Geol., 48: 788-794.
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  49. Parthasarathy, G., 2005. Phase transition of amphiboles from the Archean section of the Kola Superdeep well (12,148 meters)- and surface analogues. Indian Mineral., 39: 71-82.

  50. Parthasarathy, G. and U. Chandra, 2005. Post perovskite phase of Nano-Crystalline perovskite at Mantle Pressures- Electrical Resistivity and Mossbauer Spectroscopic Studies. Deep Cont. Stud. India, 15: 7-10.

  51. Chandra, U., P. Mudgal, M. Kumar, R. Rawat, G. Parthasarathy, N. Dilawar and A.K. Bandyopadhyay, 2005. High-Pressure Mossbauer Measurements on Nanocrystalline Perovskite (La,Sr)(Mn,Fe)O3. Hyperfine Interact., 163: 129-141.
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  52. Bhandari, N., S.V.S. Murty, P.N. Shukla, R.R. Mahajan and A.D. Shukla et al., 2005. Bhawad LL6 chondrite: Chemistry, petrology, noble gases, nuclear tracks, and cosmogenic radionuclides. Meteorit. Planet. Sci., 40: 1015-1021.
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  53. Parthasarathy, G. and S.R. Sharma, 2004. High-temperature electrical and thermal properties of Burdett, Dalhart, Faucet and Wellman ordinary chondrites. Curr. Sci., 86: 1366-1368.

  54. Dhingra, D., N. Bhandari, P.N. Shukla, S.V.S. Murty and R.R. Mahajan et al., 2004. Spectacular fall of the Kendrapara H5 chondrite. Meteorit. Planet. Sci., 39: A121-A132.
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  55. Chandra, U., and G. Parthasarathy, 2004. High-pressure electrical resistivity behaviour of nanocrystalline perovskite (La, Sr)(Mn, Fe)O3. Philos. Mag. Lett., 84: 565-573.
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  56. Parthasarathy, G., S.R. Sharma, T.R. Ravindran, A.K. Arora and S.M. Hussain, 2003. Structural and thermal studies of graphite from East Antarctica. J. Geol. Soc. India, 61: 335-343.

  57. Parthasarathy, G., B.M. Choudary, B. Sreedhar, A.C. Kunwar and R. Srinivasan, 2003. Ferrous saponite from the Deccan Trap, India, and its application in adsorption and reduction of hexavalent chromium. Am. Mineral., 88: 1983-1988.
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  58. Parthasarathy, G. and M. Vairamani, 2003. Testing for fullerenes in geologic materials: Oklo carbonaceous substances, Karelian shungites, Sudbury Black Tuff: Comment and Reply COMMENT. Geol., 31: e32-e33.
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  59. Chandra, U., Y.K. Sharma, A. Gupta, G. Parthasarathy and A.K. Bandyopadhyay, 2003. High-pressure phase transition in 57 Fe 0.03 Cr 0.97 Sb 2: A Mossbauer and resistivity study up to 8 GPa. Philos. Mag. Lett., 83: 273-285.
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  60. Parthasarathy, G., T.R.K. Chetty and S.E. Haggerty, 2002. Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India. Am. Mineral., 87: 1384-1389.
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  61. Parthasarathy, G., N. Bhandari, M. Vairamani, A.C. Kunwar and B. Narasaiah, 2002. Natural fullerenes from the Cretaceous-Tertiary boundary layer at Anjar, Kutch, India. Geol. Soc. Am., 356: 345-350.

  62. Parthasarathy, G., M.L. Kantam, B.M. Choudary and C.V. Reddy, 2002. Pressure-induced phase transitions of hydrotalcite by electrical resistivity, structural and thermal studies. Microporous Mesoporous Mater., 56: 147-152.
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  63. Parthasarathy, G., S.R. Sharma and S.M. Hussain, 2002. Hussain High-temperature studies on graphites from East Antarctica. J. Appl. Geochem., 4: 263-270.

  64. Parthasarathy, G. and T.N. Gowd, 2002. Structural, Electrical and Thermal phase stability of cummingtonite from KOLA SUPER DEEP BOREHOLE (KSDB-3), Russia. J. Appl. Geochem., 4: 103-114.

  65. Ghosh, P., S.K. Bhattacharya, A.D. Shukla, P.N. Shukla, N. Bhandari, G. Parthasarathy and A.C. Kunwar, 2002. Negative δ13C excursion and anoxia at the Permo-Triassic boundary in the Tethys Sea. Curr. Sci., 83: 498-502.

  66. Sharma, S.R., G. Parthasarathy, T.R. Ravindran, A.K. Arora and S.M. Hussain, 2001. Laser-Raman spectroscopic studies on graphite from East Antarctica. Polar Geosci., 14: 157-164.

  67. Parthasarathy, G., A.C. Kunwar and R. Srinivasan, 2001. Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India. Eur. J. Mineral., 13: 127-137.
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  68. Parthasarathy, G. and S.R. Sharma, 2001. A Comparative Study on Structural Properties of Graphites from Dharwar Craton, India: A High-Temperature DTA Study. J. Geol. Soc. India, 57: 435-442.

  69. Kumar, P.S., G. Parthasarathy, S.D. Sharma, R. Srinivasan and P. Krishnamurthy, 2001. Mineralogical and Geochemical Study on Carbonate Veins of the Salem-Attur Fault Zone, Southern India: Evidence for Carbonatitic Affinity. J. Geol. Soc. India, 58: 15-26.

  70. Sharma, S.R., G. Parthasarathy, T.R. Ravindran, A.K. Arora and B. Kumar, 2000. Laser Raman Spectroscopic Studies on Graphites From Dharwar Craton: A Possible Metamorphic Grade Indicator for the Host Rocks. J. Geol. Soc. India, 55: 413-420.
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  71. Sarma, L.P. and G. Parthasarathy, 1999. Thermal Decomposition of Natural Actinolite: A High Temperature Electrical Resistivity Study. J. Geol. Soc. India, 53: 571-578.
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  72. Parthasarathy, G., V. Balaram and R. Srinivasan, 1999. Characterization of green garnets from an Archean calc-silicate rock, Bandihalli, Karnataka, India: evidence for a continuous solid solution between uvarovite and grandite. J. Asian Earth Sci., 17: 345-352.
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  73. Sharma, S.R., G. Parthasarathy and B. Kumar, 1998. X-ray Diffraction Studies on Graphites from Dharwar Craton. J. Geol. Soc. India, 51: 517-522.
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  74. Parthasarathy, G., R. Srinivasan, M. Vairamani, K. Ravikumar and A.C. Kunwar, 1998. Occurrence of natural fullerenes in low grade metamorphosed Proterozoic shungite from Karelia, Russia. Geochim. Cosmochim. Acta, 62: 3541-3544.
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  75. Parthasarathy, G., R. Srinivasan, M. Vairamani, K. Ravikumar and A.C. Kunwar, 1998. Fullerene from the proterozoic shungite deposit at Kondopoga, Karelia, Russia: Isotopic and spectroscopic studies. Chin. Sci. Bull., 43: 98-98.
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  76. Parthasarathy, G., S. Asokan and V. Ganesan, 1997. Pressure-Induced Transformation in Natural Muscovite: An Electrical Resistivity Study. In: Advances in high-Pressure Science and Technology. Md. Yousuf and Subramaniyan (Ed.). University Press, India, ISBN: 8173711224, pp 119-120.

  77. Prasad, M.V.N., S. Asokan, G. Parthasarathy, S.S.K. Titus and E.S.R. Gopal, 1995. Thermal crystallization studies on Ga–Te glasses. J. Therm. Anal., 44: 583-587.
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  78. Prasad, M.V.N., S. Asokan, G. Parthasarathy, S.S.K. Titus and E.S.R. Gopal, 1993. High pressure electrical resistivity studies on Ga-Te glasses. High Pressure Res., 11: 195-200.
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  79. Prasad, M.V.N., S. Asokan, G. Parthasarathy, S.S.K. Titus and E.S.R. Gopal, 1993. Electrical-Resistivity Studies on GE-SE Glasses at High-Pressures and Low-Temperatures. Phys. Chem. Glasses, 34: 199-202.
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  80. Ramakrishna, R., S. Asokan, G. Parthasarathy, S.S.K. Titus and E.S.R. Gopal, 1992. Calorimetric studies of AlxTe100−x glasses: composition dependence of crystallization and a new compound in the Al-Te system. J. Non-Cryst. Solids, 139: 129-136.
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  81. Fei, Y., H.K. Mao, J. Shu, G. Parthasarathy, W.A. Bassett and J. Ko, 1992. Simultaneous high-P, high-T X ray diffraction study of β-(Mg,Fe)2SiO4 to 26 GPa and 900 K. J. Geophys. Res.: Solid Earth, 97: 4489-4495.
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  82. Xia, H., G. Parthasarathy, H. Luo, Y.K. Vohra and A.L. Ruoff, 1990. Crystal structures of group IVa metals at ultrahigh pressures. Phys. Rev. B, 10.1103/PhysRevB.42.6736.
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  83. Madhusoodanan, K.N., J. Philip, S. Asokan, G. Parthasarathy and E.S.R. Gopal, 1990. Photoacoustic Study of the Glass Transition and Crystallization in Bulk GexTe1-x and SixTe1-x Glasses. In: Photoacoustic and Photothermal Phenomena II. Murphy J.C. et al., (Eds.). Springer Berlin Heidelberg, Heidelberg, Germany, ISBN: 978-3-662-13795-6, pp 183-185.
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  84. Madhusoodan, K.N., J. Phillip, S. Asokan, G. Parthasarathy and E.S.R. Gopal, 1989. Photoacoustic investigation of the optical absorption and thermal diffusivity in SixTe100−x glasses. J. Non-Cryst. Solids, 109: 255-261.
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  85. Asokan, S., M.V.N. Prasad, G. Parthasarathy and E.S.R. Gopal, 1989. Mechanical and Chemical Thresholds in IV-VI Chalcogenide Glasses. Phys. Rev. Lett., Vol. 62 10.1103/PhysRevLett.62.808.
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  86. Anavekar, R.V., N. Devaraj, G. Parthasarathy, E.S.R. Gopal and J. Ramakrishna, 1989. Temperature and pressure dependence of direct current electrical resistivity in the Na2O-ZnO-B2O3 glass system. Phys. Chem. Glasses, 30: 172-179.
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  87. Parthasarathy, G., S. Asokan, S.S.K. Titus and R.R. Krishna, 1988. Metallization and crystallization of semiconducting amorphous Ga20Te80 alloy under high pressure. Phys. lett. A, 131: 441-444.
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  88. Parthasarathy, G. and W.B. Holzapfel, 1988. Structural phase transitions and equations of state for selenium under pressure. Phys. Rev. B, 10.1103/PhysRevB.38.10105.
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  89. Parthasarathy, G. and W.B. Holzapfel, 1988. High-pressure structural phase transitions in tellurium. Phys. Rev. B, Vol. 37 10.1103/PhysRevB.37.8499.
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  90. Madhusoodanan, K.N., J. Philip, G. Parthasarathy, S. Asokan and E.S.R. Gopal, 1988. Optical absorption and thermal diffusivity in GexTe10-x, glasses by the photoacoustic technique. Philos. Mag. B, 58: 123-132.
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  91. Bhatia, K.L., G. Parthasarathy, A. Sharma and E.S.R. Gopal, 1988. Carrier-sign reversal in Bi-doped bulk amorphous semiconductors Ge20Te80-xBix. Phys. Rev. B, Vol. 38 10.1103/PhysRevB.38.6342.
    CrossRef  |  

  92. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1988. High-pressure studies on Ge-Te glasses. Evidence for a critical composition in IV-VI chalcogenide glassy systems. Philos. Mag. B, 57: 49-60.
    CrossRef  |  

  93. Ramaseshan, S., G. Parthasarathy and E.S.R. Gopal, 1987. High Pressure Techniques At Low Temperatures. Pramana J. Phys., 28: 435-469.

  94. Parthasarathy, G., S. Asokan, M.N. Prasad and E.S.R. Gopal, 1987. Crystallization studies on bulk Ga20Te80 glass. J. Mater. Sci. Lett., 6: 75-77.
    CrossRef  |  

  95. Parthasarathy, G., S. Asokan, G.M. Naik and R.R. Krishna, 1987. Pressure-Induced transitions in amorphous TlxSe100−x alloys. Philos. Mag. Lett., 56: 191-195.
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  96. Parthasarathy, G., G.M. Naik and S. Asokan, 1987. Electrical transport and thermal studies on bulk TlxSe100−x glasses. J. Mater. Sci. Lett., 6: 181-182.
    CrossRef  |  

  97. Parthasarathy, G., G.M. Naik and Asokan, S. Naik, 1987. Preparation and characterization of bulk Tl-Ge-Se glasses. J. Mater. Sci. Lett., 6: 214-216.
    CrossRef  |  

  98. Parthasarathy, G. and S. Asokan, 1987. Effect of high pressure on the electrical resistivity of glassy oxygenated selenium. J. Mater. Sci. Lett., 6: 313-314.
    CrossRef  |  

  99. Mazumdar, D., D.N. Bose, G. Parthasarathy and E.S.R. Gopal, 1987. High-pressure studies on lithium fast-ion conductors. J. Mater. Res., 2: 366-373.
    CrossRef  |  

  100. Jain, D.C., K.S. Jerath, H.S. Chauhan, K.B. Garg, U. Chandra and R.K. Singhal et al., 1987. XANES Study of Se-Te Glasses. Key Eng. Mater., 13: 148-148.
    CrossRef  |  

  101. Gosain, D.P., K.L. Bhatia, G. Parthasarathy and Gopal, E.S.R. Parthasarathy, 1987. Impurity states in Sb‐doped amorphous semiconductors. J. Appl. Phys., 62: 2313-2319.
    CrossRef  |  

  102. Gosain, D.P., K.L. Bhatia, G. Parthasarathy and E.S.R. Gopal, 1987. Structural Transformation in N-Type Bi Doped Semiconducting Glasses Ge20S80-xBix. Key Eng. Mater., 13: 351-354.
    CrossRef  |  

  103. Baranidharan, S., E.S.R. Gopal, G. Parthasarathy and J.A. Sekhar, 1987. Crystallisation of Al-Fe icosahedral quasicrystals under high pressures. Scr. Metall., 21: 1623-1626.
    CrossRef  |  

  104. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1987. Evidence for a critical composition in group-IV-VI chalcogenide glasses. Phys. Rev. B, 10.1103/PhysRevB.35.8269.
    CrossRef  |  

  105. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1987. Crystallization studies on bulk GexTe100-x glasses. Inter. J. Rapid Solidif., 2: 257-271.

  106. Asokan, S., E.S.R. Gopal and G. Parthasarathy, 1987. Si-Te Glasses: Relation between Structure and the Physical Properties. Key Eng. Mater., 13-15: 119-130.
    CrossRef  |  

  107. Sekhar, J.A., T. Rajasekharan, P.R. Rao, G. Parthasarathy and S. Ramkumar et al., 1986. Electron and x-ray diffraction studies on Al86Fe14, Al82Fe18 and Al75Fe25 quasicrystals. Pramana, 27: 267-273.
    CrossRef  |  

  108. Parthasarathy, G., S. Asokan, E.S.R. Gopal and A.K. Bandyopadhyay, 1986. Pressure induced polymorphous crystallization in bulk Ge20Te80 glass. Physica B+C, 139: 266-268.
    CrossRef  |  

  109. Parthasarathy, G., R. Ramakrishna, S. Asokan and E.S.R. Gopal, 1986. Effect of pressure on the electrical resistivity of bulk amorphous Al23Te77 alloy under various stages of crystallization. J. Mater. Sci. Lett., 5: 809-811.
    CrossRef  |  

  110. Parthasarathy, G., E.S.R. Gopal, H.R. Krishnamurthy, R. Pandit and J.A. Sekhar, 1986. Quasi crystalline A1-Mn alloys: pressure induced crystallization and structural studies. Curr. Sci., 55: 517-520.

  111. Bhatia, K.L., D.P. Gosain, G. Parthasarathy and E.S.R. Gopal, 1986. Pressure-induced first-order transition in layered crystalline semiconductor GeSe to a metallic phase. Phys. Rev. B, Vol. 33 10.1103/PhysRevB.33.1492.
    CrossRef  |  

  112. Bhatia, K.L., D.P. Gosain, G. Parthasarathy and E.S.R. Gopal, 1986. On the structural features of doped amorphous chalcogenide semiconductors. J. Non-Cryst. Solids, 86: 65-71.
    CrossRef  |  

  113. Bhatia, K.L., D.P. Gosain, G. Parthasarathy and E.S.R. Gopal, 1986. Morphological structure of bismuth-doped n-type amorphous germanium sulphide semiconductors. J. Mater. Sci. Lett., 5: 1281-1284.
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  114. Bhatia, K.L., D.P. Gosain, G. Parthasarathy and E.S.R. Gopal, 1986. Bismuth-doped amorphous germanium sulfide semiconductors. Phys. Rev. B, Vol. 34 10.1103/PhysRevB.34.8786.
    CrossRef  |  

  115. Bhatia, K.L., D.P. Gosain, G. Parthasarasthy, E.S.T. Gopal and A.K. Sharma, 1986. Structural properties of doped n-type amorphous (GeSe3.5)100−xBix. J. Mater. Sci. Lett., 5: 181-182.
    CrossRef  |  

  116. Asokan, S., G. Parthasarathy, G.N. Subbanna and E.S.R. Gopal, 1986. Electrical transport and crystallization studies of glassy semiconducting Si20Te80 alloy at high pressure. J. Phys. Chem. Solids, 47: 341-348.
    CrossRef  |  

  117. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1986. Evidence for a new metastable crystalline compound in Ge-Te system. Mater. Res. Bull., 21: 217-224.
    CrossRef  |  

  118. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1986. Crystallization studies on bulk SixTe100−x glasses. J. Non-Cryst. Solids, 86: 48-64.
    CrossRef  |  

  119. Asokan, S., E.S.R. Gopal and G. Parthasarathy, 1986. Pressure-induced polymorphous crystallization in bulk Si20Te80 glass. J. Mater. Sci. Lett., 21: 625-629.
    CrossRef  |  

  120. Rao, K.J., G. Parthasarathy, U. Selvaraj and E.S.R. Gopal, 1985. The Effect of Pressure on the Electrical Transport Behaviour of Potassium Phospho-Molybdate Glasses. Phys. Chem. Glasses, 26: 101-104.

  121. Parthasarathy, G., E.S.R. Gopal and S.L. Kumar, 1985. Pressure and temperature dependence of the electrical resistivity of bulk Al23 Te77 glass. J. Non-Cryst. Solids, 72: 73-79.
    CrossRef  |  

  122. Parthasarathy, G. and E.S.R. Gopal, 1985. Effect of high pressure on chalcogenide glasses. Bull. Mater. Sci., 7: 271-302.
    CrossRef  |  

  123. Naik, G.M., G. Parthasarathy, E.S.R. Gopal and P.S. Narayanan, 1985. Crystallization of bulk Tl-Ge-Se glasses under high pressure. J. Mater. Sci. Lett., 4: 1017-1020.
    CrossRef  |  

  124. Gosain, D.P., K.L. Bhatia, G. Parthasarathy and E.S.R. Gopal, 1985. Pressure-induced structural transformations in Bi-doped amorphous germanium sulfide. Phys. Rev. B, Vol. 32 10.1103/PhysRevB.32.2727.
    CrossRef  |  

  125. Bhatia, K.L., G. Parthasarathy, D.P. Gosain and E.S.R. Gopal, 1985. Role of dopants in pressure-induced effects in glassy GeSe3·5 containing Bi and Sb. Philos. Mag. B, 51: L63-L68.
    CrossRef  |  

  126. Bhatia, K.L., G. Parthasarathy and E.S.R. Gopal, 1985. Study of impurity induced modifications in amorphous N-type (GeSe3·5)100-x Bix using high pressure technique. Bull.Mater. Sci., 7: 423-426.

  127. Bhatia, K.L., G. Parthasarathy and E.S.R. Gopal, 1985. Pressure induced effects in bulk amorphous n-type semiconductors (GeSe3.5)100−xBix. J. Non-Cryst. Solids, 69: 189-202.
    CrossRef  |  

  128. Asokan, S., G. Parthasarathy and E.S.R. Gopal, 1985. Double glass transition and double stage crystallization of bulk Si20Te80 glass. J. Mater. Sci. Lett., 4: 502-504.
    CrossRef  |  

  129. Rao, K.J., G. Parthasarathy, B.G. Rao and E.S.R. Gopal, 1984. Effect of pressure on the resistivity of lead oxide-lead halide glasses. Mater. Res. Bull., 19: 1221-1227.
    CrossRef  |  

  130. Prasad, M.V.N., G. Parthasarathy, S. Asokan and E.S.R. Gopal, 1984. Pressure-induced electronic and structural transformations in bulk GeSe2 glass. Pramana J. Phys., 23: 31-37.
    CrossRef  |  

  131. Parthasarathy, G., K.J. Rao and E.S.R. Gopal, 1984. Pressure transitions and electron transport behaviour of crystalline Se-Te alloys. Solid State Commun., 52: 867-871.
    CrossRef  |  

  132. Parthasarathy, G., K.J. Rao and E.S.R. Gopal, 1984. High pressure studies of Se1007-xTex glasses. Philos. Mag. B, 50: 335-346.
    CrossRef  |  

  133. Parthasarathy, G., A.K. Bandyopadhyay, S.T. Lakshmikumar and E.S.R. Gopal, 1984. A Bridgman Anvil Ssytem for High Pressure (upto 80 Kbar) Electrical Measurements at Low Temperatures (down to 77 K). J. Instrum. Soc. India, 14: 169-175.

  134. Parthasarathy, G., A.K. Bandyopadhyay, S. Asokan and E.S.R. Gopal, 1984. Electrical transport and high pressure studies on bulk Ge20Te80 glass. Pramana J. Phys., 23: 17-29.
    CrossRef  |  

  135. Parthasarathy, G., A.K. Bandyopadhyay, S. Asokan and E.S.R. Gopal, 1984. Effect of pressure on the electrical resistivity of bulk Ge20Te80 glass. Solid State Commun., 51: 195-197.
    CrossRef  |  

  136. Parthasarathy, G., A.K. Bandyopadhyay, E.S.R. Gopal and G.N. Subbanna, 1984. Double stage crystallization of bulk Ge20Te80 glass. J. Mater. Sci. Lett., 3: 97-99.
    CrossRef  |  

  137. Parthasarathy, G. and E.S.R. Gopal, 1984. Unusual Effect of Tellurium Doping on the Electrical Properties of Bulk Amorphous Selenium. Phys. Status Solidi A, 85: K165-K167.
    CrossRef  |  

  138. Parthasarathy, G. and E.S.R. Gopal, 1984. Study of phase separation and two stage crystallization in Al23Te77 glass. J. Mater. Sci. Lett., 3: 756-758.
    CrossRef  |  

  139. Parthasarathy, G. and E.S.R. Gopal, 1984. Electronic conduction in bulk Se1− Bull. Mater. Sci., 6: 231-242.
    CrossRef  |  

  140. Hemlata, S., G. Parthasarathy, K.J. Rao and E.S.R. Gopal, 1984. High pressure transport behaviour of AgI-Ag2O-MoO3 glasses and the cluster model. Pramana J. Phys., 23: L269-273.

  141. Bose, D.N., G. Parthasarathy, D. Mazumdar and E.S.R. Gopal, 1984. Resistivity Maxima in Lithium Fast-Ion Conductors at High Pressure. Phys. Rev. Lett., Vol. 53 10.1103/PhysRevLett.53.1368.
    CrossRef  |  

  142. Bhatia, K.L., G. Parthasarathy, E.S.R. Gopal and A.K. Sharma, 1984. Study of effects of dopants on structure of vitreous semiconductors (GeSe3.5)100-xMx (M = Bi, Sb) using high pressure techniques. Solid State Commun., 51: 739-742.
    CrossRef  |  

  143. Bhatia, K.L., G. Parthasarathy and E.S.R. Gopal, 1984. Electrical transport in layered crystalline semiconductors GeS doped with Ag, P impurities at high pressure. J. Phys. Chem. Solids, 45: 1189-1194.
    CrossRef  |  

  144. Senapati, H., G. Parthasarathy, S.T. Lakshmikumar and K.J. Rao, 1983. Effect of pressure on the fast-ion conduction in AgI-Ag2O-MoO3 glasses. Philos. Mag. B, 47: 291-297.
    CrossRef  |  

  145. Parthasarathy, G., S.T. Lakshmikumar and E.S.R. Gopal, 1983. Pressure Induced Metallic State in Amorphous SexTe1-x System. J. Instrum. Soc. India, 13: 295-300.

  146. Bhatia, K.L., G. Parthasarathy and E.S.R. Gopal, 1983. Electrical transport in Bi doped n-type amorphous semiconductors (GeSe3.5)100−xBix at high pressure. J. Non-Cryst. Solids, 59-60: 1019-1021.
    CrossRef  |  

  147. Bandyopadhyay, A.K., M.K. Gunasekaran, G. Parthasarathy, S. Manichavasagam and E.S.R. Gopal, 1983. A Digitally Settable Constant Current Source. J. Instrum. Soc. India, 13: 123 -127.
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