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

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Summary

Introduction

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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