Dr. Saint  Gregoire Pierre

Dr. Saint Gregoire Pierre

Professor
Arts University of Nimes, France


Highest Degree
Ph.D. in Solid State Physics from University of Montpellier, Montpellier, France

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Biography

Dr. Saint Gregoire Pierre holds a position of Professor at Arts University of Nimes, France. He has completed his Habilitation & PhD in Solid State Physics from National Center for Scientific Research, France. Previously he was appointed as Researcher at the CNRS, Professor at the Universities of Yaounde (Cameroon) and LomE (Togo), Advisor to the Minister of Education for Higher Education and leader of a support project at the University of Bangui. He also worked on research projects in the field of Incommensurate Phases, Phase Transitions, Ferroic Materials, and Materials for Photovoltaic and Ecomaterials. He is also serving as editor for number of journal. He also directed number of PhD students. He is President of the association Scientia ad Progressum. He has published 2 books, 108 research articles in journals, 70 papers in proceedings of international meetings, and 70 communications by poster contributed as author/co-author. He also delivered 23 invited talks at international conferences. He also served as Visiting Professor at the Institute SHUFCI University of Shanghai, Guests at the Federal University of Minas Gerais.

Area of Interest:

Physics
100%
Material Science
62%
Structural Phase Transitions
90%
Ferroelectrics
75%
Incommensurate Phases
55%

Selected Publications

  1. Vaillant, L., E. Vigil, F. Forcade, T. Thami and H. Adnani et al., 2015. On fundamental mechanisms in dye sensitized solar cells through the behaviour of different mesoporous titanium dioxide films. Eur. Phys. J. Appl. Phys., Vol. 72. 10.1051/epjap/2015150221.
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  2. Gonzalez-Abreu, Y., A. Pelaiz-Barranco, Y. Gagou, J. Belhadi and P. Saint-Gregoire, 2015. Vibrational analysis on two-layer aurivillius phase Sr1-xBaxBi2Nb2O9 using raman spectroscopy. Vib. Spectrosc., 77: 1-4.
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  3. Smirnov, M. and P. Saint-Gregoire, 2014. Unified approach for determining tetragonal tungsten bronze crystal structures. Acta Crystallogr., Sect. A: Found. Adv., 70: 283-290.
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  4. Laghrib, S., M. Hamici, Y. Gagou, L.V. Roca and P. Saint-Gregoire, 2014. Synthesis of In2S3(1-x) O3x thin films by oxidation of In2S3 film and influence of film microstructure. Phys. Status Solidi A, 211: 2865-2870.
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  5. Gonzalez-Abreu, Y., A. Pelaiz-Barranco, J.D.S. Guerra, Y. Gagou and P. Saint-Gregoire, 2014. From normal ferroelectric transition to relaxor behavior in aurivillius ferroelectric ceramics. J. Mater. Sci., 49: 7437-7444.
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  6. Sidorkin, A.S., P. Saint-Gregoire and L.P. Nesterenko, 2013. Fatigue phenomena in thin ferroelectric films stimulated by repeated switching of the polarization. J. Adv. Dielectr., Vol. 3. .
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  7. Gonzalez-Abreu, Y., A. Pelaiz-Barranco, J.D.S. Guerra and P. Saint-Gregoire, 2013. Piezoelectric behavior in Sr1-xBaxBi2Nb2O9 Aurivillius-type structure ferroelectric ceramics. Phys. Status Solidi B, 250: 1551-1555.
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  8. Pelaiz Barranco, A., Y. Mendez Gonzalez, D.C. Arnold, P. Saint-Gregoire, D.J. Keeble, 2012. Incorporation of lanthanide ions in lead titanate. J. Mater. Sci., 47: 1094-1099.
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  9. Ondrejkovic, P., M. Kempa, Y. Vysochanskii, P. Saint-Gregoire, P. Bourges, K.Z. Rushchanskii and J. Hlinka, 2012. Neutron scattering study of ferroelectric Sn2P2S6 under pressure. Phys. Rev. B, Vol. 86. 10.1103/PhysRevB.86.224106.
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  10. Gagou, Y., A. Menny, J. Belhadi, M.A. Fremy and D. Mezzane et al., 2012. Pulsed laser deposition of TTB-type materials thin films example of Pb2KNb5O15 (PKN) and GdK2Nb5O15 (GKN). Res. J. Nanosci. Nanotechnol., 2: 24-30.
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  11. Choukri, E., Y. Gagou, D. Mezzane, Z. Abkhar and R. El Moznine et al., 2011. Dielectric and structural properties of diffuse ferroelectric phase transition in Pb1.85K1.15Li0.15Nb5O15 ceramic. Eur. Phys. J. Applied Phys., 53: 20901-20901.
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  12. Choukri, E., Y. Gagou, A. Belboukhari, G. Erramo and M.A. Fremy et al., 2011. Phase diagram and dielectric properties of ferroelectrics ceramics Pb2-xK1+xLixNb5O15. Superlattices Microstruct., 49: 300-306.
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  13. Smirnov, M., N. Mazhenov, N. Aliouane and P. Saint-Gregoire, 2010. Novel features of the α-β phase transition in quartz-type FePO4 as evidenced by x-ray diffraction and lattice dynamics. J. Phys. Condens. Matter, 22: 225403-225413.
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  14. Choukri, E., Z. Abkhar, Y. Gagou, M.A. Fremy and J.L. Dellis et al., 2010. Dielectric properties of lead potassium lithium niobate (Pb1.85K1.15Li0.15Nb5O15) with Tetragonal Tungsten Bronze (TTB) type structure. J. Cond. Matter, 12: 86-91.
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  15. Choukri, E., Y. Gagou, D. Mezzane, M. Elmarssi and Z. Abkhar et al., 2010. Phase diagram of TTB ferroelectric compounds Pb1-xK2xNb2O6. J. Cond. Matter, 12: 81-85.

  16. Belboukhari, A., D. Mezzane, Y. Gagou, M. Elmarssi, I. Lukyanchuk, A. Zegzouti and P. Saint-Gregoire, 2010. Dielectric properties of new ferroelectric lead potassium niobate Pb0.9K0.2Nb2O6. M. J. Cond. Matter, 12: 103-107.
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  17. Saint-Gregoire, P., Y. Gagou and T. Badeche, 2008. Anomalies of thermal dilatation and domain structure in the multiferroic material PbK2LiNb5O15. Ferroelectrics, 376: 17-24.
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  18. Saint-Gregoire, P., 2008. Overview on fields related to renewable energies relevant for north south collaborations. Int. Sci. J. Alter. Energy Ecol., 5: 11-20.
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  19. Gagou, Y., M.A. Fremy, T. Badeche, D. Mezzane, H. Choukri and P. Saint-Gregoire, 2008. Ionic conduction properties in PbK2LiNb5O15. Ferroelectrics, 371: 17-20.
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  20. Gagou, Y., E. Padayodi, K.E. Atcholi and P. Saint-Gregoire, 2008. Study of the mechanical behaviour of clay, a natural material for house construction. Int. Sci. J. Alter. Energy Ecol., 6: 187-193.
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  21. Moreira, R.L., M.A.S. Oliveira, P. Saint-Gregoire and J.Y. Gesland, 2006. Ferroelastic transitions and cracks in Li3ThF7 single crystals Ferroelectrics, 334: 57-65.
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  22. Ouedraogo, A., I. Lukyanchuk and P. Saint-Gregoire, 2004. Polarization rotation in the incommensurate phase of Sn2P2 (SexS1-x)6. Ferroelectrics, 302: 137-141.
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  23. Jorio, A., M.S.S. Dantas, N.L. Speziali, M.A. Pimenta, C.B. Pinheiro, I. Lukyanchuk and P. Saint-Gregoire, 2004. Structural and dynamical aspects of structural phase transitions on incommensurate A2BX4 compounds. Ferroelectrics, 305: 75-78.
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  24. Gagou, Y., C. Muller, M.A. Fremy, E. Elkaim and P. Saint-Gregoire, 2004. Structural study of ferroelectric and paraelectric phases of PbK2LiNb5O15. Phys. Stat. Sol. b, 241: 2629-2938.
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  25. Saint-Gregoire, P., E. Snoeck, C. Roucau, N. Aliouane, I. Luk'yanchuk, 2003. Anomalous light scattering in quartz: Ferroelastic versus metastable EQT blocks models. Ferroelectrics, 290: 97-104.
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  26. Oualla, M., A. Zegzouti, M. Elaatmani, M. Daoud, D. Mezzane, Y. Gagou and P. Saint-Gregoire, 2003. New gadolinium based ferroelectric phases derived from the Tetragonal Tungsten Bronze (TTB). Ferroelectrics, 291: 133-139.
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  27. Badeche, T., Y. Gagou, C. Roucau, M.A. Fremy, D. Mezzane and P. Saint-Gregoire, 2003. HREM Study of the room temperature phase of PbK2LiNb5O15. Ferroelectrics, 290: 83-90.
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  28. Augereau, F., G. Despaux and P. Saint-Gregoire, 2003. Imaging ferroic domains structures with an acoustic microscope: Example of PPLN. Ferroelectrics, 290: 29-38.
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  29. Lukyanchuk, I. and P. Saint-Gregoire, 2002. Stress-induced change of the Lifshitz point type in A2BX4 compounds. J. Phys. Condens. Matter, 14: 7487-7491.
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  30. Gagou, Y., C. Muller, N. Aliouane, E. Elkaim, G. Nihoul and P. Saint-Gregoire, 2002. Structural and electrical properties of the new ferroelectric PbK2LiNb5O15. Ferroelectrics, 268: 417-422.
    CrossRef  |  

  31. Saint-Gregoire, P., I. Luk'yanchuk and N. Aliouane, 2001. The Elongated-Triangle (ELT) phase in quartz as an incommensurate ferroelastic. Izvestija Akademii Nauk, Serija Fizicheskaja, 65: 1119-1126.
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  32. Saint-Gregoire, P., E. Snoeck and N. Aliouane, 2001. On the evolution of texture between α and β phases in quartz: Aspects relevant with the problem of the anomalous light scattering. Ferroelectrics, 252: 1-9.
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  33. Mezzane, D., Y. Gagou, N. Aliouane, A. Flory, T. Badeche, A. Zegzouti and P. Saint-Gregoire, 2001. A DMA study of the ferroelectric-ferroelastic structure change in PbK2LiNb5O15. Izvestija Akademii Nauk, Serija Fizicheskaja, 65: 1134-1137.
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  34. Gagou, Y., D. Mezzane, N. Aliouane, T. Badeche, M. Elaatmani, M.H. Pischedda and P. Saint-Gregoire, 2001. A new ferroelectric compound: PbK2LiNb5O15. Ferroelectrics, 254: 197-204.
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  35. Gagou, Y., D. Mezzane, N. Aliouane, J. Fabry and T. Badeche et al., 2001. Structural change and some associated anomalies in the ferroelectric PbK2LiNb5O15. Ferroelectrics, 251: 131-137.
    Direct Link  |  

  36. Badeche, T., Y. Gagou, N. Aliouane, O.A. Aktsipetrov, M.H. Pischedda and P. Saint-Gregoire, 2001. Structural characterization of PZT thin films and related properties. Ferroelectrics, 254: 403-410.
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  37. Saint-Gregoire, P., 2000. On the anomalous light scattering in quartz: A critical overview and recent results. Ferroelectrics, 240: 1405-1412.
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  38. Perez, A., H. Ottavi and P. Saint-Gregoire, 2000. Lattice spin model AB1B2. Comput. Mater. Sci., 18: 167-176.
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  39. Luk'yanchuk, I., A. Jorio and P. Saint-Gregoire, 2000. Thermodynamics of the incommensurate state in Rb2WO4: The Lifshitz point in A2BX4 compounds. Phys. Rev. B, 61: 3147-3150.
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  40. Jorio, A., R. Currat, D.A.A. Myles, G.J. McIntyre, I.P. Aleksandrova, J.M. Kiat and P. Saint-Gregoire, 2000. Ferroelastic phase transition in Cs3Bi2I9: A neutron diffraction study. Phys. Rev. B, 61: 3857-3862.
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  41. Jorio, A., P. Saint-Gregoire and M. Pimenta, 2000. High-temperature phase transitions in incommensurate Rb2WO4. J. Phys.: Condens. Matter, 12: 9307-9315.
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  42. Aliouane, N., T. Badeche, Y. Gagou, E. Nigrelli and P. Saint-Gregoire, 2000. Synthesis and phase transitions of iron phosphate. Ferroelectrics, 241: 255-262.
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  43. Saint-Gregoire, P., R. Almairac, E. Snoeck, J. Moret and V. Kopsky, 1999. Structural organization of fullerenes C60, C70, C84. Ferroelectrics, 221: 37-46.
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  44. Saint-Gregoire, P., 1999. Role of the Coupling between Strains and Order Parameter Gradient in Crystals. Phase Trans., 67: 587-615.
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  45. Saint-Gregoire, P. and I. Luk'yanchuk, 1999. Comment on inhomogeneities and birefringence in quartz. J. Phys.: Condens. Matter, 11: 8169-8173.
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  46. Enjalbert, R., J. Galy, Y. Vysochanskii, A. Ouedraogo and P. Saint-Gregoire, 1999. Structural study of the ferroelectric instability in Sn2P2Se6. Eur. Phys. J. B Condensed Matter Complex Syst., 8: 169-177.
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  47. Zapart, B., E. Snoeck and P. Saint-Gregoire, 1997. Dense domain structure in ferroelastics by EPR. Ferroelectrics, 191: 179-185.
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  48. Saint-Gregoire, P., V. Janovec and V. Kopsky, 1997. A sample analysis of domain walls in simple cubic phase of C60. Ferroelectrics, 191: 73-78.
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  49. Saint-Gregoire, P., 1997. On mesoscopic structure of incommensurate phases: Domain textures and textural blocks. Ferroelectrics, 192: 61-70.
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  50. Saint-Gregoire, P. and I. Lukyanchuk, 1997. Domain textures of multi-q modulated phases: Example of quartz. Ferroelectrics, 191: 267-273.

  51. Eijt, S.W., R. Currat, J.E. Lorenzo, S. Katano, P. Saint-Gregoire, B. Hennion and Y. Vysochanskii, 1997. Soft mode behaviour of incommensurate Sn2P2Se6: An inelastic neutron scattering study. Ferroelectrics, 202: 121-129.
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  52. Saint-Gregoire, P., V. Janovec and B. Davies, 1996. Primary and secondary domain states in the simple cubic phase of C60. Ferrolectrics, 185: 71-76.
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  53. Saint-Gregoire, P., E. Snoeck, C. Roucau, I. Lukyanchuk and V. Janovec. 1996. A novel type of incommensurate phase in quartz: The elongated-triangle phase. JETP Lett., 64: 410-415.
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  54. Saint-Gregoire, P., 1996. On improper ferroelastics among incommensurate materials. Ferroelectrics, 175: 25-39.
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  55. Mahoui, A., J. Lapasset, J. Moret, M. Lopez and P. Saint-Gregoire, 1996. Structural changes in tetraethylammonium copper chloride. Ferroelectrics, 175: 79-84.
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  56. Mahoui, A., J. Lapasset, J. Moret and P. Saint-Gregoire, 1996. Bis(tetraethylammonium) tetrachlorometallates [(C2H5)4N]2[MCl4], where M = Hg, Cd, Zn. Acta Crystallogr. Sect. C: Cryst. Struct. Commun., 52: 2671-2674.
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  57. Mahoui, A., J. Lapasset, J. Moret and P. Saint-Gregoire, 1996. Tetraethylammonium Tetramethylammonium Tetrachlorocuprate (II) [(C2H5)4N][(CH3)4N] [CuCl4]. Acta Cryst., C52: 2674-2676.
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  58. Mahoui, A., J. Lapasset, D.G. Sannikov, J. Moret and P. Saint-Gregoire, 1996. On the ordering in [(C2H5)4 N] 2 Cu Cl4 crystal: An X-ray study and theoretical considerations. Z. Phys. B, 99: 543-549.
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  59. Saint-Gregoire, P., I. Luk'yanchuk, E. Snoeck, C. Roucau and V. Janovec, 1995. New incommensurate elongated-triangle phase in quartz. JETP Lett., Vol. 64. 10.1134/1.567212.
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  60. Saint-Gregoire, P., 1995. Ferroelastic incommensurate phases. Key Eng. Mater., 101-102: 237-284.
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  61. Snoeck, E., P. Saint-Gregoire, V. Janovec and C. Roucau, 1994. T.E.M. study of 3-q modulated phase of quartz-type under electric field. Ferroelectrics, 155: 371-376.
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  62. Sannikov, D.G., R. Almairac, A. Astito, J. Moret, J. Lapasset and P.Saint-Gregoire, 1994. Phenomenological theory of the transitions in the [P(CH3)4]2 (CuCl4)x (CuBr4)1-x solid solution. J. Phys., 6: 849-849.
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  63. Astito, A., R. Almairac, J. Moret, P. Saint-Gregoire and J. Lapasset, 1994. Coupled instabilities in the solid solution [P(CH3)4]2(CuCI4)1-x(CuBr4)x. Ferroelectrics, 155: 287-291.
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  64. Saint-Gregoire, P., E. Snoeck, V. Janovec and C. Roucau, 1993. New details on the Structure of the 3-q modulated phase of quartz type. Phys. Status Solidi A, 139: 361-370.
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  65. Astito, A., R. Almairac, J. Lapasset, P. Saint-Gregoire and J. Moret, 1993. Phase transitions and domain structure in a doubly unstable compound. Ferroelectrics, 141: 19-24.
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  66. Saint-Gregoire, P., V. Janovec, E. Snoeck, C. Roucau and Z. Zikmund, 1992. Domain wall vertices in Quartz: Symmetry, Classification and T.E.M. Observation. Ferroelectrics, 125: 209-214.
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  67. Kroupa, J., W. Schranz, A. Fuith, H. Warhanek and P. Saint-Gregoire, 1992. Study of the Linear Birefringence and Domain Structure in {N(CH3)4}2CoCl4 and {N(CD3)4}2ZnCl4. Ferroelectrics, 125: 165-170.
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  68. Almairac, R., H. Aarab and P. Saint-Gregoire, 1992. Kinetics of the Incommensurate to Commensurate transition in the solid solution (NH4)1-x (BeF4) x (SO4). Phase Transitions, 37: 165-177.
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  69. Saint-Gregoire, P., 1991. Change of domain structure at lock-in transitions. Phase Transitions, 30: 255-258.
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  70. Kroupa, J., W. Schranz, A. Fuith, H. Warhanek and P. Saint-Gregoire, 1991. Optical study of the phase transitions in [N(CH3)4]2CoCl4 and [N(CD3)4]2ZnCl4. J. Phys. Condens. Matter, 3: 5975-5975.
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  71. Bianchi, U., W. Kleemann and P. Saint-Gregoire, 1991. Linear birefringence studies of incommensurate systems: II. KfeF4. Phase Transitions, 36: 155-164.
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  72. Saint-Gregoire, P., R. Almairac, J. Lapasset and J. Moret, 1990. Structural phase transitions in KfeF4 and related materials. Phys. Status Solidi A, 120: K25-K29.
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  73. Mezzane, D., M. Bziouet and P. Saint-Gregoire, 1990. Influence of thermal history on dielectric anomalies in incommensurate (TMA)2ZnCl4. Ferroelectrics Lett., 11: 79-88.
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  74. Saint-Gregoire, P., M. Ribet and K. Tchakpele, 1989. Ferroelastic walls in lock-in phases of {N(CD3)4}2ZnCl4 and {N(CH3)4}2CuCl4. Ferroelectrics, 97: 277-292.

  75. Saint-Gregoire, P. and V. Janovec, 1989. Modulated Phases in Crystals: Symmetries of Walls and Wall Lattices: Example of Quartz. In: Lecture Notes in Physics, Barthes, M. and J. Leon (Eds.). Springer Verlag, USA.

  76. Saint-Gregoire, P. and V. Janovec, 1989. Analysis of linear defects in triply-incommensurate phase of quartz-type. Ferroelectrics, 97: 299-311.
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  77. Saint-Gregoire, P. and A. Perez, 1989. Prediction of modulation wave vector rotation in incommensurate crystals under field or stress. Proceedings of the 7th International Meeting of Ferroelectricity, September, 1989, Saarbrucken, Germany -.

  78. Saint-Gregoire, P., W. Kleemann, F.J. Schafer and J. Moret, 1988. On the incommensurate phase in BaMnF4: sample dependence of the order parameter. J. Phys. France, 49: 463-469.
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  79. Saint-Gregoire, P., 1987. Intrinsic Defects in Insulating Incommensurate Crystals. In: Incommensurate Crystals, Liquid Crystals and Quasi Crystals, Scott, J.F. and N.A. Clark (Eds.). Plenum Press, USA., pp 151-162.

  80. Snoeck, E., C. Roucau and P. Saint-Gregoire, 1986. Electron microscopy study of the modulated phases in berlinite AlPO4 and quartz. J. Physique, 47: 2041-2053.
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  81. Saint-Gregoire, P., R. Almairac, A. Freund and J. Y.Gesland, 1986. Barium manganese fluoride BaMnF4 as an improper ferroelastic. Ferroelectrics, 67: 15-21.

  82. Almairac, R., M. Siali, S. Vilminot, P. Saint-Gregoire, G. Delplanque and G. Barre, 1985. Phase incommensurable dans le compose mixte (NH4) 2(BeF4)0,82(SO4)0,18. J. Phys. Lett., 46: L1123-L1131.
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  83. Saint-Gregoire, P., M. Barthes, R. Almairac, J. Nouet, J.Y. Gesland, C. Filippini and U. Steigenberger, 1984. On the incommensurate phase in BaMnF4: A neutron scattering study. Effect of the pressure. Ferroelectrics, 53: 307-310.
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  84. Saint-Gregoire, P. F.J. Schafer, W. Kleemann, J. Durand and A. Goiffon, 1984. Birefringence study of the α-β transformation of berlinite, AlPO4. J. Phys. C, 17: 1375-1375.
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  85. Bachheimer, J.P., B. Berge, G. Dolino, P. Saint-Gregoire and C.M.E. Zeyen, 1984. Calorimetric and neutron scattering studies of the incommensurate phase of berlinite AlPO4. Solid State Commun., 51: 55-58.
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  86. Saint-Gregoire, P. and A. Perez, 1983. Possible incommensurate phase in KFeF4. Z. Krist., 163: 135-138.
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  87. Barthes-Regis, M., R. Almairac, P. Saint-Gregoire, C. Filippini, U. Steigenberger J. Nouet and J.Y. Gesland, 1983. Temperature dependence of the wave vector of the incommensurate modulation in two BaMnF4 crystals grown by different techniques, neutron and X-ray measurements. J. Phys. Lett., 44: L829-L835.
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  88. Regis, M., M. Candille, P. Saint-Gregoire, 1980. Optical study of the structural phase transition of BaMnF4. J. Phys. Lett., 41: 423-425.
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