کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1600234 1515867 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
First-principles investigations on structural, elastic, thermodynamic and electronic properties of Ni3X (X = Al, Ga and Ge) under pressure
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
First-principles investigations on structural, elastic, thermodynamic and electronic properties of Ni3X (X = Al, Ga and Ge) under pressure
چکیده انگلیسی


• Pressure dependence of structure and properties were studied for Ni3X (X = Al, Ga and Ge).
• All the three compounds are mechanically stable under the pressure up to 50 GPa.
• Debye temperature of Ni3X increase with pressure increasing.
• All those compounds are ductile materials.
• Ni3X have no structural phase transformation under the pressure up to 50 GPa.

The structural, elastic, thermodynamic and electronic properties of L12-ordered intermetallic compounds Ni3X (X = Al, Ga and Ge) under pressure range from 0 to 50 GPa with a step of 10 GPa have been investigated using first-principles method based on density functional theory (DFT). The calculated structural parameters of Ni3X at zero pressure and zero temperature are consistent with the experimental data. The results of bulk modulus B, shear modulus G, Young's modulus E, Poisson's ratio v, anisotropy index AU and Debye temperature ΘD increase with the increase of external pressure. In addition, the Debye temperature of these compounds gradually reduce as the order of Ni3Al > Ni3Ga > Ni3Ge. The ratio of shear modulus to bulk modulus G/B shows that the three binary compounds are ductile materials, and the ductility of Ni3Al and Ni3Ga can be improved with pressure going up, while Ni3Ge is opposite. Finally, the pressure-dependent behavior of density of states, Mulliken charge and bond length are analyzed to explore the physical origin of the pressure effect on the structural, elastic and thermodynamic properties of Ni3X.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 44, January 2014, Pages 110–115
نویسندگان
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