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Prof. Mohamad Mahmoud Ahmad Mohamad

Professor, Department of Physics , Faculty of Science (at New Valley), ِِAssiut University

C.V Details




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Office Tel.

:

2055

E-Mail

:

m_mohamad@aun.edu.eg
m_mohamad@aun.edu.eg

google scholar link

:

https://scholar.google.com/citations?user=VaYmCbgAAAAJ&hl=en&oi=ao
Educational Qualifications:
  • Ph. D. In Physics ( Solid State Physics ) , Faculty of Science, Assiut University, 2004


 

 
  • Professor, Department of Physics , Faculty of Science (at New Valley), ِِAssiut University, 2015
  • Associate Professor, Department of Physics , Faculty of Science (at New Valley), Assiut University, 2009
  • Lecturer, , Faculty of Education (at New Valley), Assiut University, 2004
  • Assistant Lecturer, , Faculty of Education (at New Valley), Assiut University, 1999
  • Demonstrator, , Faculty of Education (at New Valley), Assiut University, 1995

Research fields:
experimental solid state

Publications:

1 - Mohamad M. Ahmad, Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics, Nanoscale Research Letters, Springer, 10, 58: 1-10, February, 2015
2 - Mohamad M. Ahmad, Estimation of the concentration and mobility of mobile Li+ ions in the cubic garnet-type Li7La3Zr2O12, RSC Advances, Royal Society of Chemistry, Vol. 5, 25824, March, 2015
3 - Mohamad M. Ahmad, One-Step Mechanochemical synthesis and Enhanced Ionic Conductivity of AgI-Al2O3 composite materials, Zeitschrift fuer Naturforschung A , De Gruyter, Vol. 70, 17, 2015
4 - Mohamad M. Ahmad, Enhanced lithium ionic conductivity and study of the relaxation and giant dielectric properties of spark plasma sintered Li5La3Nb2O12 nanomaterials, Ceramics International, Elsevier, Vol. 41, 6398, 2015
5 - Mohamad M. Ahmad, Giant dielectric properties of nanocrystalline Pb1-xSnxF2 solid solutions, Journal of Materials Science: Materials in Electronics, Vol. 25, 4398, 2014
6 - Mohamad M. Ahmad, Koji Yamada, Grain size effect on the giant dielectric constant of CaCu3Ti4O12 nanoceramics prepared by mechanosynthesis and spark plasma sintering, Journal of Applied Physics, Vol. 115, 154103, 2014
7 - M.M. Ahmad, E. Al-Libidi, A. Al-Jaafari, S. Ghazanfar and K. Yamada, Mechanochemical synthesis and giant dielectric properties of CaCu3Ti4O12, Applied Physics A, Vol. 116, 1299, 2014
8 - Mohamad M. Ahmad, Giant dielectric constant in CaCu3Ti4O12 nanoceramics, Applied Physics Letters, Vol. 102, 232908, 2013
9 - M.M. Ahmad*, Y. Yamane, and K. Yamada, The ionic conductivity and dielectric properties of Ba1-xSnxF2 solid solutions prepared by mechanochemical milling, Materials Science and Engineering B , Vol. 178, 965, 2013
10 - M.M. Ahmad*, Y. Yamane, and K. Yamada, Structure, ionic conduction, and giant dielectric properties of mechanochemically synthesized BaSnF4, Journal of Applied Physics, Vol. 106, 074106 , 2009
11 - Mohamad M. Ahmad, Koji Yamada, Hopping rates and concentration of mobile fluoride ions in Pb1-xSnxF2 solid solutions, The Journal of Chemical Physical, Vol. 127, 124507, 2007
12 - M.M. Ahmad*, Y. Yamane, K. Yamada, S. Tanaka, Dielectric relaxation properties of Pb1-xSnxF2 solid solutions prepared by mechanochemical milling, Journal of Physics D: Applied Physics, Vol. 40, 6020, 2007
13 - Mohamad M. Ahmad, Koji Yamada, Superionic PbSnF4: A giant dielectric constant material, Applied Physics Letters, Vol. 91, 052912, 2007
14 - M.A. Gaffar*, M.M. Ahmad, K. Yamada and T. Okuda, The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO4, competition between Rb sub-lattice and smearing the phase transition, Journal of Physics D: Applied Physics, Vol. 40, 4360, 2007
15 - M.M. Ahmad*, K. Yamada, P. Meuffels and R. Waser, Aging-induced dielectric relaxation in barium titanate ceramics, Applied Physics Letters, Vol. 90, 112902, 2007
16 - M.M. Ahmad*, M.A. Gaffar, K. Yamada and T. Okuda, Ion dynamics and structure-dependent conductivity scaling properties in polycrystalline LiK1-xRbxSO4, Journal of Physics and Chemistry of Solids, Vol. 68, 470, 2007
17 - J.R. Macdonald and M.M. Ahmad, Slopes, nearly constant loss, universality, and hopping rates for dispersive ionic conduction, Journal of Physics: Condensed Matter, Vol. 19, 046215, 2007
18 - M.M. Ahmad, S.A. Makhlouf, K.M.S.Khalil, Dielectric behavior and ac conductivity study of NiO/Al2O3 nanocomposites in humid atmosphere , J. Appl. Phys. , American Institute of Physics (AIP), 100, 094323, http://jap.aip.org/, 2006
19 - M.M. Ahmad, S.A. Makhlouf and K.M.S. Khalil, Dielectric behavior and ac conductivity of NiO/Al2O3 nanocomposites in humid atmosphere, Journal of Applied Physics, Vol. 100, 094323, 2006
20 - Mohamad M. Ahmad, Ionic conduction and dielectric relaxation in polycrystalline Na2SO4, Solid State Ionics, Vol. 177, 21, 2006
21 - M.M. Ahmad, E. Yousef and E. Mostfa, Dielectric properties of the ternary TeO2-Nb2O5-ZnO glasses, Physica B, Vol. 371, 74, 2006
22 - Mohamad M. Ahmad, Estimation of the charge-carrier concentration and ac-conductivity scaling properties near the V-I phase transition of polycrystalline Na2SO4, Physical Review B, Vol. 72, 174303, 2005
23 - Mohamad M. Ahmad, Ionic conduction and relaxation in some superionic fluoride ion conductors, Defect and Diffusion Forum, Vol. 229, 1, 2004
24 - K. Yamada, M.M. Ahmad, Y. Ogiso, T. Okuda, J. Chikami, G. Miehe, H. Ehrenberg and H. Fuess, Two dimensional fluoride ion conductor RbSn2F5 studied by impedance spectroscopy and 19F, 119Sn and 87Rb NMR, The European Physical Journal B, , Vol. 40, 167, 2004
25 - M.M. Ahmad, K. Yamada and T. Okuda, Conductivity spectra and comparative scaling studies of polycrystalline PbSnF4, Solid State Ionics, Vol. 167, 285, 2004
26 - K. Yamada, M.M. Ahmad, H. Ohki, T. Okuda, H. Ehrenberg and H. Fuess, Structural phase transition of the two-dimensional fluoride ion conductor KSn2F5 studied by X-ray diffraction, Solid State Ionics, Vol. 167, 301, 2004
27 - M.M. Ahmad, K. Yamada and T. Okuda, Ionic conduction and relaxation in KSn2F5 fluoride ion conductor, Physica B, Vol. 339, 94, 2003
28 - M.M. Ahmad, M.A. Hefni, A.H. Moharram, G.M. Shurit, K. Yamada and T. Okuda, , “Fluoride ion dynamics and relaxation in KSn2F5 studied by 19F NMR and impedance spectroscopy, Journal of Physics: Condensed Matter, Vol. 15, 5341, 2003
29 - M.M. Ahmad, K. Yamada and T. Okuda, Fluoride ion diffusion of superionic PbSnF4 studied by NMR and impedance spectroscopy, Journal of Physics: Condensed Matter, Vol. 14, 7233, 2002
30 - M.M. Ahmad, K. Yamada and T. Okuda , Frequency dependent conductivity and dielectric studies on RbSn2F5, Solid State Communications, Vol. 123, 185, 2002
31 - M.M. Ahmad and M.A. Hefni, Effect of Li content on the DSC and electrical conductivity of (Li1-xKx)2SO4 mixed crystals, Zeitschrift fur Naturforschung A, Vol. 56, 677, 2001
32 - M.A. Osman, M.A. Hefni, R.M. Mahfouz and M.M. Ahmad, g-irradiation effect on the electrical properties of LiKSO4, Physica B, Vol. 301, 318, 2001
33 - M.M. Ahmad and M.A. Hefni, DSC and electrical conductivity studies of (Li1-xKx)2SO4 mixed crystals, Radiation Effects and Defects in Solids, Vol. 153, 359, 2001
34 - M.A. Hefni, M.A. Osman, R.M. Mahfouz and M.M. Ahmad, g-irradiation effect on the spectroscopic and electrical properties of K2SO4-Na2SO4 mixed system, Radiation Effects and Defects in Solids, Vol. 153, 151, 2001
35 - M.A. Osman, M.A. Hefni, R.M. Mahfouz and M.M. Ahmad, Spectroscopic studies and electrical conductivity behavior of g-irradiated Li2SO4-Na2SO4 mixed system, Radiation Effects and Defects in Solids, Vol. 153, 115, 2001
36 - M.A. Hefni, M.A. Osman, R.M. Mahfouz and M.M. Ahmad, Electron paramagnetic resonance, infrared, and electrical conductivity studies of -ray irradiated Li2SO4- K2SO4 mixed system, Radiation Effects and Defects in Solids, Vol. 152, 255, 2000
37 - M.A. Hefni, M.A. Osman, R.M. Mahfouz and M.M. Ahmad, Electron paramagnetic resonance studies of g-ray irradiated Li2SO4- K2SO4 mixed crystals, Arab Journal of Nuclear Sciences and Applications, Vol. 32, 190, 1999

Supervisions :

1- Nasser Mohammed Farhan , M. Sc, 18 August 2008
Number of courses0 course