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