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Article
First Principle Calculation of Pressure-Induced Phase Transition and Band Structure of Gallium Phosphide

Author: Kh. Kabita et al.
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2013 Volume: 9 Issue: 4 Pages: 17-20
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

A first principle study of the electronic, structural and phase transition of the III-V binary compound semiconductor gallium phosphide (GaP) is performed under the framework of density functional theory (DFT). Structural transformation from the zinc-blende (ZB) to rocksalt (RS) structure is observed at a pressure of about 21.9 GPa and the dependence of the volume decrease of ZB to RS structure at the transition pressure is 14.11% . The variation of the energy band gap, elastic constants and debye’s temperature with pressure are also obtained successfully. Our results are found to be in consistent with other experimental and theoretical results.


Article
Spin compensation temperatures in the Oguchi approximation of the mixed spin

Authors: Hasan Fareed --- Hadey K. Mohamad
Journal: Journal of Education for Pure Science مجلة التربية للعلوم الصرفة ISSN: 20736592 Year: 2018 Volume: 8 Issue: 1 Pages: 274-283
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

AbstractUsing the Oguchi lattice, mixed spin


Article
Study the Characteristic of the Coupling Parameter ( Г ) in Dusty Plasma by Computer modeling
دراسة خصائص عامل الترابط ( Г ) في البلازما المغبرة باستخدام نمذجه حاسوبيه

Authors: Bayan G. Ali بيان غني علي --- Hamid H. Murbat حامد حافظ مربط
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2010 Volume: 7 Issue: عدد خاص بمؤتمر العلمي النسوي 1 Pages: 98-104
Publisher: Baghdad University جامعة بغداد

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Abstract

Computer modeling has been used to investing the Coulomb coupling parameter Г. The effects of the structure parameter K, grain charge Z, plasma density N, temperature dust grain Td, on the Coulomb coupling parameter had been studied. It was seen that the Γ was increasing with increasing Z and N, and decrease with increasing K and T. Also the critical value of Γ that the phase transfer of the plasma state from liquid to solid was studied.

دُرس عامل الترابط Г في البلازما المغبرة باستعمال نمذجه حاسوبيه. دُرس تأثير كل من عامل البناء K ,شحنه الحبيبة Z , كثافة البلازما N , ودرجه حرارة الحبيبة Td على عامل الترابط Г. لوحظ بأن عامل الترابط Г يزداد بزيادة شحنه الحبيبة Z و كثافة البلازما N ويقل بزيادة عامل البناء K ودرجه حرارة الحبيبة Td . حُسبت كذلك القيمة ألحرجه لعامل cГ لانتقال طور البلازما من الحالة الغازية الى الحالة الصلبة.


Article
Study the Characteristic of the Coupling Parameter ( Г ) in Dusty Plasma by Computer modeling

Authors: Bayan G. Ali --- Hamid H. Murbat
Journal: Journal of College of Education مجلة كلية التربية ISSN: 18120380 Year: 2011 Issue: 6 Pages: 467-477
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Computer modeling has been used to investing the Coulomb couplingparameter Г. The effects of the structure parameter K, grain charge Z,plasma density N, temperature dust grain Td, on the Coulomb couplingparameter had been studied. It was seen that the Γ was increasing withincreasing Z and N, and decrease with increasing K and T. Also thecritical value of Γ that the phase transfer of the plasma state from liquidto solid was studied.

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