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Study of Thermodynamics of Liquid Noble-metals Alloys Through a Pseudopotential Theory

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Communications in Theoretical Physics 2010年第9期54卷 551-558页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S.College of Diploma Engineering

The Gibbs-Bogoliubov (GB) inequality is applied to investigate the thermodynamic properties of someequiatomic noble metal alloys in liquid phase such as Au-Cu,Ag-Cu,and Ag-Au using well recognized *** description of the structure,well known Percus-Yevick (PY) hard sphere model is used as a *** applying a variation method the best hard core diameters have been found which correspond to minimumfree *** this procedure the thermodynamic properties such as entropy and heat of mixing have been *** influence of local held correction function viz;Hartree (H),Taylor (T),Ichimaru-Utsumi (IU),Farid et al.(F),and Sarkar et al.(S) is also *** computed results of the excess entropy compares favourably in the caseof liquid alloys while the agreement with experiment is poor in the case of heats of *** may be due to thesensitivity of the heats of mixing with the potential parameters and the dielectric function.

关键词： Gibbs-Bogoliubov (GB) inequality liquid noble metals binary alloys pseudopotential method Percus-Yevick (PY) hard sphere model local field correction functions thermodynamic properties

Electron Dispersion in Liquid Alkali and Their Alloys

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Communications in Theoretical Physics 2010年第7期54卷 159-166页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S.College of Diploma Engineering

Ashcroft＇s local empty core （EmC） model pseudopotential in the second-order perturbation theory is used to study the electron dispersion relation, the Fermi energy, and deviation in the Fermi energy from free electron value for the liquid alkali metals and their equiatomic binary alloys for the first time. In the present computation, the use of pseudo-alloy-atom model （PAA） is proposed and found successful. The influence of the six different forms of the local field correction functions proposed by Hartree （H）, Vashishta Singwi （VS）, Taylor （T）, lehimaru-Utsumi （IU）, Farid et al. （F）, and Sarkar et al. （S） on the aforesaid electronic properties is examined explicitly, which reflects the varying effects of screening. The depth of the negative hump in the electron dispersion of liquid alkalis decreases in the order Li --→ K, except for Rb and Cs, it increases. The results of alloys are in predictive nature.

关键词： pseudopotential Fermi energy electron dispersion curves local field correction functions alkalimetals and their alloys

Stacking fault energy in some single crystals

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Journal of Semiconductors 2012年第6期33卷 1-5页

作者： aditya m.vora Humanities and Social Science Department

The stacking fault energy of single crystals has been reported using the peak shift *** studied all single crystals are grown by using a direct vapor transport（DVT） technique in the *** structural characterizations of these crystals are made by *** variations are shown in deformation （α） and growth（β） probabilities in single crystals due to off-stoichiometry,which possesses the stacking fault in the single crystal.

关键词： single crystals X-ray diffrectograms deformation probability growth probability stacking fault

Effect of rhenium doping on various physical properties of single crystals of moSe_2

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Journal of Semiconductors 2012年第1期33卷 20-24页

作者： mihir m.vora aditya m.vora Parmeshwari 165 Vijaynagar Area Hospital RoadBhuj-Kutch370001GujaratIndia Humanities and Social Science Department S.T.B.S.College of Diploma EngineeringShri Swami Atmanand Sarswati Vidya SankulOpp.Kapodra Police StationVarachha RoadSurat 395006GujaratIndia

Effect of rhenium doping is examined in single crystals of moSe2 viz. moRe0.005Sel.995, moReo.o01 Sel.999 and moo.995Re0.005Se2, which is grown by using the direct vapor transport （DVT） technique. The grown crystals are structurally characterized by X-ray diffraction, by determining their lattice parameters a and c, and X-ray density. Also, the Hall effect and thermoelectric power （TEP） measurements show that the single crystals exhibit a p-type semiconducting nature. The direct and indirect band gap measurements are also undertaken on these semiconducting materials.

关键词： structural properties electrical properties optical properties single crystals

Transport Properties of Si and Ge Liquid Semiconductor metals

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Communications in Theoretical Physics 2009年第3期51卷 550-554页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S. College of Diploma Engineering

In the present article, we study the electrical resistivity ρ, the thermoelectric power （TEP） α, thermal conductivity σ, Knight-Shifts and temperature coefficient of the Knight-Shifts of the liquid Si and Ge using the well known model potential for the first time. The structure factor used in the present work is derived from the Percus-Yevick （PY） theory. Various local field correction functions are used to study the screening influence. The present results of resistivity are found in qualitative agreement with available experimental and theoretical whenever exists.

关键词： pseudopotential electrical resistivity thermoelectric power Knight Shift PY theory local field correction functions

Phonon dynamics of glassy copper alloys

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Frontiers of Chemistry in China 2011年第1期6卷 54-68页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well recognized model potential is used to investigate the phonon properties for five glassy Copper alloys ***_(57)Zr_(43),Cu_(60)W_(40),Cu_(33)Y_(67),Cu_(43)Ti_(57) and Cu_(66)Ti_(34).The thermodynamic and elastic properties are also computed from the elastic limits of the phonon dispersion curves(PDC).Three theoretical approaches given by Hubbard-Beeby(HB),Takeno-Goda(TG)and Bhatia-Singh(BS)are used in the present study to compute the *** local field correction functions proposed by Hartree(H),Taylor(T),Ichimaru-Utsumi(IU),Farid et al.(F)and Sarkar et al.(S)are employed to see the effect of exchange and correlation in the aforesaid properties.

关键词： pseudopotential pair potential phonon dispersion curves(PDC) glassy copper alloys

Vibrational dynamics of Fe-based glassy alloys

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Frontiers of Chemistry in China 2011年第2期6卷 127-141页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well recognized model potential is used to investigate the vibrational properties of four Fe-based binary glassy alloys ***_(90)Zr_(10),Fe_(80)B_(20),Fe_(83)B_(17) and Fe_(80)P_(20).The thermodynamic and elastic properties are also computed from the elastic limits of the phonon dispersion curves(PDC).Three theoretical approaches given by Hubbard-Beeby(HB),Takeno-Goda(TG)and Bhatia-Singh(BS)are used in the present study to compute the *** local field correction functions proposed by Hartree(H),Taylor(T),Ichimaru-Utsumi(IU),Farid et al.(F)and Sarkar et al.(S)and Sarkar et al.’s local field factor(SLFF)based excgange and correlation function are employed to see the effect of exchange and correlation in the aforesaid properties.

关键词： pseudopotential pair potential phonon dispersion curves(PDC) Fe-based binary glassy alloys static properties vibrational properties

Vibrational dynamics of Ni-glassy alloys

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Frontiers of Chemistry in China 2011年第3期6卷 227-242页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well known model potential is used to investigate the vibrational properties of some Ni-based binary glassy alloys using three theoretical *** local field correction functions are employed to see the effect of exc... 详细信息

关键词： pseudopotential pair potential phonon dispersion curves(PDC) Ni-based amorphous binary alloys local field correction functions

Phonon Dispersion in Ca70mg30 metallic Glass

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Chinese Physics Letters 2006年第7期23卷 1872-1875页

作者： aditya m. vora Sadhu Vaswani International School 12/C Lilashah Nagar Gandhidham (Kutch) 370 201 Gujarat India

The phonon dispersion curves （PDC） of Ca70mg30 metallic glass has been studied at room temperature in terms of phonon eigen frequencies of longitudinal and transverse modes employing three different approaches proposed by Hubbard and Beeby （J. Phys. C： Solid State Phys. 13 （1969） 556）, Takeno and Goda （Prog. Theor. Phys. 45 （1971） 331; 47 （1972） 790） and Bhatia and Singh （Phys. Rev. B 31 （1985） 4751）. The well recognized model potential of Gajjar et al. is employed successfully to explain electron-ion interaction in the metallic glass. The effective pair potential is used to generate the pair correlation function g（r）. The local field correction function （Int. J. mod. Phys. B 17 （2003） 6001） is used for the first time to introduce the exchange and correlation effects on the aforesaid properties. The present findings of PDCs are found to be in agreement with the available theoretical as well as experimental data. The thermodynamic and elastic properties, i.e. longitudinal and transverse sound velocities, isothermal bulk modulus, modulus of rigidity, Poisson＇s ratio, Young＇s modulus and Debye temperature, are also investigated successfully.

关键词： SUPERCONDUCTING STATE PARAmETERS COLLECTIVE mOTION LIQUIDS FREQUENCIES DYNAmICS SOLIDS mODEL