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Influence of substitutional nitrogen in synthetic saw-grade diamond on crystal strength

Published online by Cambridge University Press:  31 January 2011

W. E. Jackson  and
Steven W. Webb
W. E. Jackson
Affiliation:
GE Superabrasives, 6325 Huntley Road, Worthington, Ohio 43085
Steven W. Webb
Affiliation:
GE Superabrasives, 6325 Huntley Road, Worthington, Ohio 43085
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Abstract

The amount and defect type of substitutional nitrogen in synthetic diamond strongly influences crystal strength. There is an optimum amount of nitrogen that yields the highest compressive fracture strength for crystals derived from common growth conditions. It is postulated that the role of nitrogen is to charge-balance vacancies created during growth. If too little nitrogen exists in the diamond, vacancies are not charge-balanced and may serve as crack initiation and/or propagation sites. Excess nitrogen above that required to charge-balance vacancies may weaken the lattice by adding local strain to the crystal. IR microscopy indicates that most of the substitutional nitrogen in synthetic diamond is increased in the vicinity of the intersections of growth sectors on the crystal surface. Most surface IR-visible nitrogen is biased toward the (111)–(100) intersection. The bias in incorporation of substitutional nitrogen at external growth sector intersections (i.e., edges and corners) of an industrial high-grade saw diamond crystal influences the progression of fatigue by microfracture during cutting of hard stone.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 6 , June 1997 , pp. 1646 - 1654
Copyright
Copyright © Materials Research Society 1997

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