The growth mechanism of diamond crystals in acetylene flames

To discuss the diamond growth mechanism in acetylene flames, numerical calculations are carried out, including both gaseous reactions in the boundary layer near a water-cooled substrate and overall surface reactions on a growing crystal. It is shown that stable species such as CH 4 and C 2 H 4 are r...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1990-08, Vol.29 (8), p.1552-1560
Main Authors: MATSUI, Y, YABE, H, HIROSE, Y
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:To discuss the diamond growth mechanism in acetylene flames, numerical calculations are carried out, including both gaseous reactions in the boundary layer near a water-cooled substrate and overall surface reactions on a growing crystal. It is shown that stable species such as CH 4 and C 2 H 4 are rapidly produced in the layer, followed by the methyl radical formation according to the fast partial equilibrium of the reaction, CH 4 +H\rightleftarrowsCH 3 +H 2 . The comparison between the calculated and the measured CH 4 concentrations upon the substrate has revealed that C -radicals adsorbed on the diamond surface are etched by H-atoms to form CH 4 , though the surface reactions do not have a significant effect on the gaseous concentrations. The dependences of the growth rate both on the substrate temperature and on the C 2 H 2 /O 2 ratio are shown to be explainable by the CH 3 -precursor model.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.29.1552