CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Theoretical Study of Elastic Properties of Tungsten Disilicide |
XU Guo-Liang1, ZHANG Dong-Ling2, XIA Yao-Zheng1, LIU Xue-Feng1, LIU Yu-Fang1, ZHANG Xian-Zhou1 |
1College of Physics and Information Engineering, Henan Normal University, Xinxiang 4530072College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000 |
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Cite this article: |
XU Guo-Liang, ZHANG Dong-Ling, XIA Yao-Zheng et al 2009 Chin. Phys. Lett. 26 046302 |
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Abstract The plane-wave pseudopotential method using the generalized gradient approximation within the framework of density functional theory is applied to analyse the lattice parameters, elastic constants, bulk moduli, shear moduli and Young's moduli of WSi2. The quasi-harmonic Debye model, using a set of total energy versus cell volume obtained with the plane-wave pseudopotential method, is applied to the study of the elastic properties and vibrational effects. The athermal elastic constants of WSi2 are calculated as a function of pressure up to 35GPa. The relationship between bulk modulus and temperature up to 1200K is also obtained. Moreover, the Debye temperature is determined from the non-equilibrium Gibbs function. The calculated results are in good agreement with the experimental data.
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Keywords:
63.20.Dk
61.82.Bg
63.70.+h
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Received: 30 December 2008
Published: 25 March 2009
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PACS: |
63.20.dk
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(First-principles theory)
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61.82.Bg
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(Metals and alloys)
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63.70.+h
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(Statistical mechanics of lattice vibrations and displacive phase transitions)
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