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Proceedings Paper

Some Properties Of Synthetic Single Crystal And Thin Film Diamonds
Author(s): Shuji Yazu; Shuichi Sato; Naoji Fujimori
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Paper Abstract

Large synthetic diamond single crystals, in sizes up to 1.4 ct, are produced on 4 commercial basis for some industrial application fields by Sumitomo Electric. The crystals are yellow colored type Ib stones which contain lower amounts of nitrogen (up to about 100 ppm) dispersed through the crystal structure in the form of singly substituting atoms. The impurity controlled type lb crystals have the highest thermal conductivity which is equivalent to that of pure type IIa crystals. Optical and thermal properties of diamond crystals are strongly affected by dispersed impurities. We studied the kinds of dispersed impurities and amounts of those impurity atoms in our synthesized crystals by SIMS. A relation of the thermal conductivities and the nitrogen concentrations of the crystals was examined. The state of nitrogen impurity in the crystals could be transformed by electron irradiation and subsequent high temperature annealing. The reaction rates for the transformation Ib nitrogen to type IaA aggregates and differences in crystal growth sectors have been studied. Vapor phase deposited diamond films are hopeful candidates for optical application of diamond. Preliminary spectroscopic analysis has been done for the free standing polycrystalline films.

Paper Details

Date Published: 17 January 1989
PDF: 7 pages
Proc. SPIE 0969, Diamond Optics, (17 January 1989); doi: 10.1117/12.948154
Show Author Affiliations
Shuji Yazu, Sumitomo Electric Industries Ltd. (Japan)
Shuichi Sato, Sumitomo Electric Industries Ltd. (Japan)
Naoji Fujimori, Sumitomo Electric Industries Ltd. (Japan)

Published in SPIE Proceedings Vol. 0969:
Diamond Optics
Albert Feldman; Sandor Holly, Editor(s)

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