Calculation of Diamond Phase Diagrams in the CO/H2 System under Low Pressure

Abstract

Abstract: The phase diagrams of diamond synthesis in CO＋H₂ mixture gases were obtAlNed accordingto non-equilibrium thermodynamic coupling model. Thesc phase diagrams have diamond stabilityregions, which arc different from tile phase diagrams predicted by classical equilibrium thermodynamic theory. The existence of diamond stability regions is attributed to the distinctive effectsof super-equilibrium atomic hydrogen and atomic oxygen on diamond and graphite. With thepressure decreasing, the diamond stability region moves toward low CO concentration end. The diamond stability regions calculated in the present work are in agreement with the experimental results reported in literatures.

Key words: diamond, phase diagram, chemical vapor deposition

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ZHANG Wei,WAN Yongzhong,WANG Jitao. Calculation of Diamond Phase Diagrams in the CO/H₂ System under Low Pressure[J]. Journal of Inorganic Materials.

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Calculation of Diamond Phase Diagrams in the CO/H₂ System under Low Pressure

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