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Synthesis of prismatic and tabular diamond crystals

Published online by Cambridge University Press:  05 July 2018

S. Kuge ,
M. Koizumi ,
Y. Miyamoto ,
H. Takubo  and
S. Kume
S. Kuge
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Suita 565, Japan
M. Koizumi
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Suita 565, Japan
Y. Miyamoto
Affiliation:
College of General Education, Osaka University, Toyonaka 560, Japan
H. Takubo
Affiliation:
College of General Education, Osaka University, Toyonaka 560, Japan
S. Kume
Affiliation:
College of General Education, Osaka University, Toyonaka 560, Japan
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Summary

When diamond is synthesized at conditions of comparatively high temperature and pressure, the nucleation rate is high, as is the growth rate of the nuclei. Consequently the product is usually an aggregate of crystals with dendritic or skeletal structure. In this study the presence of gold or silver as an additive mixed with a catalyst was found to have the effect of suppressing nucleation. When a homogeneous mixture of graphite, catalyst, and additive was treated at conditions where skeletons and dendrites were produced in the absence of additive, euhedral crystals of octahedra were formed. When a special cell assemblage for high pressure experiments, in which the graphite was placed inside a cylinder of catalyst coated with additive, was used, prismatic and tabular crystals were synthesized.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 329 , March 1980 , pp. 579 - 581
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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Footnotes

*

Present address: Ishizuka Research Institute Ltd., Hiratsuka, 254 , Japan.

References

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