Effect of Hydrogen on the Structure of Ultradisperse Diamond

A. E. Aleksenski, M. V. Badakova, A. Ya. Vul’, A. T. Didekin, V. I. Siklitski, and S. P. Vul’

Ioffe Physicotechnical Institute, Russian Academy of Sciences,
Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia

Received January 20, 2000; in final form, February 18, 2000

Abstract—The paper reports on a study of the effect of annealing in hydrogen on the structural phase transition
in clusters of ultradisperse diamond (UDD) obtained by the detonation method. The samples studied were of
two types, namely, prepared by the “dry” and “wet” techniques, which differ in the cooling rate of the detona-
tion products and, accordingly, in the structure of the diamond nanocluster shell. It is shown that, irrespective
of the type of synthesis, the relative content of the diamond (sp3) phase increases within the anneal temperature
range of 450 to 750°C, the increase being more pronounced in the samples prepared by “dry” synthesis.
Amodel accounting for the observed structural transformation processes is discussed. A hypothesis of the
possibility of compacting UDD clusters into bulk single crystals is put forward. © 2000 MAIK “Nauka/Inter-
periodica”.

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