Prof. Dr. Ahmad Kamal H. Yahya

Prof. Dr. Ahmad Kamal H. Yahya

Professor
Universiti Teknologi MARA, Malaysia


Highest Degree
Ph.D. in Physics from University of Kebangsaan Malaysia, Malaysia

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Area of Interest:

Physics
100%
Applied Physics
62%
Functional Oxides
90%
Ceramic Oxygen Sensor
75%
Colossal Magnetoresistance
55%

Selected Publications

  1. Hassan, M. and A.K. Yahya, 2010. Influence of hot-spot temperature on oxygen sensing response behavior of Er123 ceramic rods with hot spot. J. Alloys Compounds, 499: 206-211.
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  2. Bakar, M.F. and A.K. Yahya, 2010. Distinct effects of Al3+ substitution at Cu-site and Al2O3 addition on step-like elastic anomalies and electron–phonon coupling constant in EuBa2Cu3O7−δ superconductors. J. Alloys Compounds, 490: 358-365.
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  3. Ahmad, N.H., N.A. Khan and A.K. Yahya, 2010. Superconducting fluctuation behavior and infrared absorption properties of Tl1−xCuxSr1.6Yb0.4CaCu2O7-δ and Tl0.5Pb0.5Sr2−yMgyCa0.8Yb0.2Cu2O7−δ ceramics. J. Alloys Compounds, 492: 473-481.
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  4. Yusof, M.I., A.K. Yahya, Z. Salleh and M.H. Jumali, 2009. Superconductivity and enhancement of critical current density of Ta-substituted TlSr1212 with Addition of nanosize MgO. Mater. Res. Innovat., 13: 364-367.
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  5. Yahya, A.K., 2009. Influence of Pr substitution on acoustic gruneisen parameter and lattice vibrational anharmonicity contribution in ceramic superconductors. J. Phys.: Conf. Ser., 153: 1-7.
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  6. Yahya, A.K., 2009. Gruneisen Parameter and anharmonic contribution to temperature dependent ultrasonic velocity in RE based and Tl based superconductors with different oxygen contents. Mater. Res. Innovat., 13: 344-347.
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  7. Yahya, A.K. and B. Musa, 2009. Effects of Al and Cr substitutions for Cu on superconductivity and structure of EuBaSrCu3O7-δ Ceramics. Mater. Res. Innovation, 13: 372-374.
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  8. Rasih, N.A. and A.K. Yahya, 2009. Effect of Ba-Site Substitution by Sr on Ultrasonic Velocity and Electron-Phonon Coupling Constant of DyBa2-xSrxCu3O7-δ Superconductors. J. Alloys Compounds, 480: 777-781.
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  9. Idrus, L.H. and A.K. Yahya, 2009. Resistance-based ceramic Ho123 ionic conductor for oxygen gas sensing. Proc. Am. Instit. Phys. Conf., 1150: 219-222.
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  10. Huda, N. and A.K. Yahya, 2009. Effects of Cu Substitution on Superconductivity and Excess Conductivity of Tl1-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0-0.6) Ceramics. Mater. Res. Innovation, 13: 406-408.
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  11. Hassan, M. and A.K. Yahya, 2009. Oxygen Response of Hot Spot on DyBa2Cu3O7-x Ceramic Sensors Fabricated Under Different Heat Treatments. Mater. Res. Innovation, 13: 357-360.
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  12. Aini, N.A., M.I.M. Yusof, N. Huda, Z. Mohamed and A.K. Yahya, 2009. Electrical Transport and Low-Field Magnetoresistance Properties of (La1-x Yb x)2/3Ca1/3MnO3 (x=0 to 0·12) Ceramics. Mater. Res. Innovation, 13: 400-402.
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  13. Huda, N., A.K. Yahya and W.F. Abdullah, 2008. Effect of Yb Substitution on Excess Conductivity of (Tl,Pb)(Sr,Yb)2CaCu2O7-δ superconductors. Am. Inst. Phys. 1017: 114-118.
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  14. Hassan, M., A.K. Yahya, K.H.K. Hamid and Z. Awang, 2008. Fabrication and performance of ceramic Er123 oxygen gas sensor. Am. Inst. Phys., 1017: 295-299.
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  15. Yahya, A.K., Z. Salleh and M.H. Jumali, 2007. Superconductor and critical current density of MgO-added Tl0.5Pb0.5Sr1.8Yb0.2CaCu2O7. Am. Inst. Phys. 909: 265-268.
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  16. Yahya, A.K., W.F. Abdullah, H. Imad and M.H. Jumali, 2007. Changes in doping state of (Tl,Pb)Sr1212 superconductors with Yb substitution at Sr site. Physica C. Superconductivity, 463-465: 474-477.
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  17. Salleh, F.M., A.K. Yahya, M.H. Jumali and Z. Awang, 2007. Synthesis of high purity Tl1212 superconductor with ultrafine grains from coprecipitated Tl-free precursor route. J. Mater. Sci. Mater. Electr., 18: 843-846.
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  18. Musa, B., A.K. Yahya and M.H. Jumali, 2007. Superconductivity of TlSr1212 derivative with Mo and in substitution at Sr-Site. Am. Inst. Phys., 909: 186-192.
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  19. Hamadneh, I., A. Agil, A.K. Yahya and S. Halim, 2007. Superconducting properties of bulk Superconducting Properties of Bulk Bi1.6Pb0.4Sr2Ca2- xCdxCu3O10 System Prepared Via Conventional Solid State and Coprecipitation Methods. system prepared via conventional solid state and co-precipitation methods. Physica C: Superconductivity, 463-465: 207-210.
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  20. Yahya, A.K., A. Ishak, I. Hamadneh and R. Abd-Shukor, 2006. Effects of Ho3+ substitution on ultrasonic attenuation in HoBa2-XHoXCu3O7-δ superconductors. Mater. Sci. Forum, 517: 17-20.
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  21. Salleh, F.M., A.K. Yahya, M.H. Ismail and M.H. Jumali, 2006. Effects of annealing on phase formation and critical current density of dip-coated Tl0.5Pb0.5 Sr1.8Yb0.2CaCu2O7 superconducting tapes. Mater. Sci. Forum, 517: 13-26.
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  22. Salleh, F.M., A.K. Yahya, H. Imad and M.H. Jumali, 2005. Synthesis and Formation of TlSr1212 Superconductors from Co-precipitated oxalate precursors. Phys. C: Superconduct., 426-431: 319-324.
    CrossRef  |  

  23. Musa, B., A.K. Yahya, F.M. Salleh and R. Abd-Shukor, 2005. Effects of Ag addition on superconductivity and microstructure of DyBa2Cu3O7-δ-Ag composite. Mater. Sci. Forum, 517: 41-44.
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  24. Yahya, A.K., W.F. Abdullah, M.H. Jumali, H. Imad and R. Abd-Shukor, 2004. Superconducting and normal state behaviors of (Tl,Bi) Sr2-xTixCa0.9Y0.1Cu2O7 ceramics. Ceramic Int., 30: 1591-1595.
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  25. Yahya, A.K., N.A. Hamid, R. Abd-Shukor and H. Imad, 2004. Anomalous elastic response of HoBa2-xHoxCu3O7-δ ceramic superconductors. J. Ceramics Int., 30: 1597-1601.
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  26. Hamid, N.A., B. Musa, A.K. Yahya, M.H. Jumali and R. Abd-Shukor, 2004. Effects of elemental substitutions involving V and Cr on superconductivity of TlSr2 (Ca,Y),Cu2O7 ceramics. J. Ceramics Int., 30: 1585-1589.
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  27. Yahya, A.K., F.M. Salleh, N. Ibrahim and R. Abd-Shukor, 2003. Effects of Ti substitutions on superconductivity of TlSr-1212 ceramics. Phys. C., 388-389: 371-372.
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  28. Salleh, F.M., A.K. Yahya, H. Imad and R. Abd-Shukor, 2003. Effects of Ag, Ag2O and AgNO3 addition on the superconducting properties of Tl2Ba2CaCu2O8 . Mater. Sci. Eng., 98: 17-20.
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  29. Yahya, A.K. and R. Abd-Shukor, 2002. Effects of oxygen removal on ultrasonic attenuation and elastic behavior of PrBa2Cu3OX. Supercond. Sci. Technol., 15: 302-306.
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  30. Yahya, A.K. and R. Abd-Shukor, 1999. Ultrasonic velocity measurements on superconducting and non-superconducting TlSr2Ca1-xPrxCu2O7-δ. Phys. C, 314: 117-124.
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