کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5394894 | 1505650 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ab initio studies of structural, electronic, optical and thermal properties of CuAlS2 chalcopyrite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The ground-state structural, electronic, optical and thermal properties of the CuAlS2 compound in the body centered tetragonal phase have been studied employing the full potential linearized augmented plane wave plus local orbitals method based on the density functional theory. For the exchange-correlation effects we have adopted the generalized gradient approximation (GGA) approaches due to Perdew, Burke and Ernzerhof (PBE) and Engel and Vosko (EV). The optical properties such as dielectric function, loss of energy, reflection, refraction and conductivity of CuAlS2 are presented. Thermal properties such as Gruneisen parameter, volume expansion coefficient α, bulk modulus, specific heat and entropy have been studied. The direct band gap first increases then starts decreasing with the decrease in unit cell volume. The EV-GGA provides higher value of energy band gap (2.20 eV) than PBE-GGA (1.62 eV). Our obtained value of the refractive index (2.4 eV) is in excellent agreement with the experimental value (2.0-2.5 eV). The peak of maximum conductivity is located at 7.4 eV of energy. The plasma frequency Ïp corresponds to the energy 12.45 eV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational and Theoretical Chemistry - Volume 975, Issues 1â3, 15 November 2011, Pages 122-127
Journal: Computational and Theoretical Chemistry - Volume 975, Issues 1â3, 15 November 2011, Pages 122-127
نویسندگان
U.P. Verma, Per Jensen, Monika Sharma, Poonam Singh,