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.
@article{arxiv.cond-mat/0611368,
title = {Structure, elastic properties and strength of amorphous and nanocomposite carbon},
author = {Ioannis N. Remediakis and Maria G. Fyta and Christos Mathioudakis and Georgios Kopidakis and Pantelis C. Kelires},
journal= {arXiv preprint arXiv:cond-mat/0611368},
year = {2007}
}
Comments
6 pages, submitted to Diamond and Related Materials (proceedings of the 6th Specialist Meeting on Amorphous Carbon)