Structure, elastic properties and strength of amorphous and nanocomposite carbon

Details Structure, elastic properties and strength of amorphous and nanocomposite carbon Structure, elastic properties and strength of amorphous and nanocomposite carbon

2006-11-14

arxiv.org/abs/cond-mat/0611368v1

Physics

Condensed Matter

Materials Science

6 pages, submitted to Diamond and Related Materials (proceedings of the 6th Specialist Meeting on Amorphous Carbon)

Scientific paper

We study theoretically the equilibrium structure, as well as the response under external load, of characteristic carbon-based materials. The materials considered include diamond, amorphous carbon (a-C), ``amorphous diamond'' and nanocomposite amorphous carbon (na-C). A universal bulk-modulus versus density curve is obeyed by all structures we consider. We calculate the dependence of elastic constants on the density. The strength of a-C was found to increase in roughly a linear manner, with increasing concentration of four-fold atoms, with the maximum stress of the strongest a-C sample being about half that of diamond. The response of na-C to external load is essentially identical to the response of the embedding a-C matrix.

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