Abstract
We use four different methods for testing the hypothesis of putative numerical equivalence between the hardness of diamond and the critical pressure of diamond metallization. In modeling crystal distortion by uniaxial compression, the initial calculations of external pressure give the lower limit for the critical pressure: Pm(1) = 213 GPa. This value is compared to semi-empirical findings obtained within Penn’s model for dielectrics, which is Pm(2) = 187.67 GPa. An experimental value for the Vickers hardness, which is HV(1) = 92 GPa, is compared using a semi-empirical approach. A theoretical value for diamond’s hardness calculated within the Penn’s model is HV(2) = 92.22 GPa.
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