Metastable Nanosized Diamond Formation from Fluid Systems

Abstract

The model of nanosized diamond particles formation at metastable P-T parameters from fluid is presented. It explains the specific of CVD diamond synthesis gases mixtures and hydrothermal growth of diamond at low P-T parameters as well as it explains the geneses of metamorphic and magmatic nano-and microdiamond in the shallow depth Earth rocks and the genesis of interstellar nanodiamond formations in the space.The optimal gases system compositions for metastable diamond formations have been long debated in many publications during the long period. Badziag et al. 1 came to the conclusion that nanometer-sized diamonds could be more stable than graphite when formed from hydrocarbons with a H/C ratio of more than 0.24.