Title: Elastic properties of 5d transition-metal carbides: An ab initio study
Author(s):

	L. Mex (Facultad de Ingenierнa, Universidad Autуnoma de Yucatán. Av. Industrias no Contaminantes por Periférico Norte Apdo. Postal 150 Cordemex Mérida, Yucatán, México) ,
	A. Aguayo (Facultad de Matemáticas, Universidad Autуnoma de Yucatán. Periférico Norte, Tablaje 13615, C. P. 97110, Mérida, Yucatán, México) ,
	G. Murrieta (Facultad de Matemáticas, Universidad Autуnoma de Yucatán. Periférico Norte, Tablaje 13615, C. P. 97110, Mérida, Yucatán, México)

We have systematically studied the mechanical stability of group V transition metal carbides TMC₂ (TM=Hf, Ta, W, Re, Os, Ir, Pt, and Au) in the pyrite and fluorite phase, by calculating their elastic constants within the density functional theory scheme. It was found that all but ReC₂ and OsC₂ are stable in pyrite phase. On the other hand, all metal carbides studied were unstable in the fluorite phase.

Key words: first-principles calculation, elastic constants, hard material, transition metals
PACS: 81.05.Je, 81.05.Zx, 71.15.Mb, 71.20.Be

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