Structural and mechanical properties of amorphous and nanocomposite carbonare investigated using tight-binding molecular dynamics and Monte Carlosimulations. In the case of amorphous carbon, we show that the variation ofsp^3 fraction as a function of density is linear over the whole range ofpossible densities, and that the bulk moduli follow closely the power-lawvariation suggested by Thorpe. We also review earlier work pertained to theintrinsic stress state of tetrahedral amorphous carbon. In the case ofnanocomposites, we show that the diamond inclusions are stable only in denseamorphous tetrahedral matrices. Their hardness is considerably higher than thatof pure amorphous carbon films. Fully relaxed diamond nanocomposites possesszero average intrinsic stress.
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