(a) fcc lattice viewed along the direction . (b) Diamond structure viewed along the direction . Vertical spacing is stretched for visualization.
Vickers hardness as a function of calculated surface energy and unstable stacking energy. The Vickers hardness increases in the order of Ge, Si, , , and diamond.
Vickers hardness as a function of the theoretical stress for a crack to form , the stress intensity factors for a crack to propagate , and emit a dislocation . The Vickers hardness increases in the order of Ge, Si, , , and diamond.
Surface energies .
Unstable stacking energies .
Experimental values of Vickers hardness , (111) interplanar spacing , Young’s modulus along , average shear modulus , and Poisson’s ratio along .
Regression correlation coefficients for the data in Fig. 2.
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