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High-Temperature Indentation of Natural Diamond and the Quest for Lonsdaleite

Published online by Cambridge University Press:  15 February 2011

P. Pirouz ,
A. Garg ,
X. J. Ning ,
J. W. Yang  and
S. Q. Xiao
P. Pirouz
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106
A. Garg
Affiliation:
Now at: NASA Lewis Research Center, Cleveland, OH 44135
X. J. Ning
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106
J. W. Yang
Affiliation:
Now at: APA Optics, Inc., Blaine, MN 55434
S. Q. Xiao
Affiliation:
Now at: National Center for Electron Microscopy, Lawrence Berkeley Laboratory, Berkeley, CA 94720
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Abstract

Attempts were made to produce bands of hexagonal diamond (Lonsdaleite) by high-temperature indentation of cubic diamond. (011) wafers of type I diamond were indented over the temperature range 1000–1300°C and the microstructure of the indentation plastic zone investigated by transmission electron microscopy (TEM). No hexagonal diamond was produced; instead, the plastic zone consisted of arrays of dislocations lying on the {001} planes. A possible mechanism for the generation of such dislocations, and reasons for the absence of hexagonal diamond, are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 73
Copyright
Copyright © Materials Research Society 1995

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References

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