Abstract
AbstractThe 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.
Highlights
The model of nanosized diamond particles formation at metastable P-T parameters from fluid is presented
The main part of the synthesis compositions lies in the middle part of the domain between methane and acetylene lines only the lesser part corresponds to hydrogen
The difference between ∆μg and ∆μd depends upon the difference of Pi/Pig and Pi/Pid, and at lower Picar it tends to zero, which corresponds to optimal condition of diamond formation from gaseous mixture within the range of graphite stability
Summary
The model of nanosized diamond particles formation at metastable P-T parameters from fluid is presented. Within the range of graphite stability Pig < Pid, which corresponds to preferable graphite formation from fluid phase. The condition of preferable diamond formation corresponds to Pig > Pid. The difference between ∆μg and ∆μd depends upon the difference of Pi/Pig and Pi/Pid , and at lower Picar it tends to zero, which corresponds to optimal condition of diamond formation from gaseous mixture within the range of graphite stability.
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