کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1600712 1005173 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Density functional study of the structural, electronic, elastic and thermodynamic properties of ACRu3 (A = V, Nb and Ta) compounds
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Density functional study of the structural, electronic, elastic and thermodynamic properties of ACRu3 (A = V, Nb and Ta) compounds
چکیده انگلیسی

Using a density functional scheme, we have investigated for the first time the structural, electronic, elastic and thermal properties of the ideal cubic antiperovskite carbides ACRu3 (A = V, Nb, Ta). The computed equilibrium lattice constants are in excellent agreement with the experimental data. The electronic band structures and densities of states profiles show that the studied compounds are conductors. Analysis of atomic site projected local density of states reveals that the bonding character may be described as a mixture of covalent–ionic and, due to the d states in the vicinity of the Fermi level, metallic. Pressure dependence up to 50 GPa of the single crystal and polycrystalline elastic constants has been investigated in details. Analysis of the B/G ratios shows that VCRu3 is slightly brittle while NbCRu3 and TaCRu3 are slightly ductile. We have estimated the sound velocities in the principal directions. Through the quasi-harmonic Debye model, in which the phononic effects are taken into account, the temperature and pressure effects on the lattice constant, bulk modulus, heat capacity and Debye temperature are performed.

Figure optionsDownload as PowerPoint slideResearch highlights
► Based on DFT calculations, VCRu3, NbCRu3 and TaCRu3 compounds have been investigated.
► The three compounds are conductors with a mixture of covalent-ionic for bonding.
► ACRu3 materials show mechanical stability, high elastic moduli, and high stiffness.
► VCRu3 is slightly brittle, while NbCRu3 and TaCRu3 are slightly ductile.
► ACRu3 family has a rather stiff lattice and therefore good thermal conductivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 19, Issue 4, April 2011, Pages 476–485
نویسندگان
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