Low compressible noble metal carbides with rock-salt structure: ab initio total energy calculations of the elastic stability

Details Low compressible noble metal carbides with rock-salt structure: ab initio total energy calculations of the elastic stability Low compressible noble metal carbides with rock-salt structure: ab initio total energy calculations of the elastic stability

2006-10-26

arxiv.org/abs/cond-mat/0610728v1

Physics

Condensed Matter

Materials Science

Appl. Phys. Lett. 89, 071913 (2006)

Scientific paper

10.1063/1.2335571

We have systematically studied the mechanical stability of all noble metal carbides with the rock-salt structure by calculating their elastic constants within the density function theory scheme. It was found that only four carbides (RuC, PdC, AgC and PtC) are mechanically stable. In particular, we have shown that RuC, PdC, and PtC have very high bulk modulus, which has been remarkably observed by the most recent experiment for the case of PtC. From the calculated density of states, we can conclude that these compounds are metallic, like the conventional group IV and group V transition metal carbides.

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