Relationship between Crystalline Defects and Wear of Natural Diamonds

概要

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It has been clearly shown that the micro-fracture strength of a diamond is determined by the type and density of the intrinsic defects in the diamond's crystalline structure. In this study, cathodoluminescence (CL) was used as a non-destructive method of evaluating the micro-strength of raw diamonds in order to observe a natural diamond which had been thermally etched in plasma. It was confirmed that the etched structure and the CL structure were closely correlated, and it was clearly demonstrated that the preferentially etched parts were 2.46 eV zero-phonon line emission centers at which isolated substitutional nitrogen was present. From these results, CL was concluded to be a useful method of obtaining information for the design of diamond ultraprecision cutting tools.
社団法人応用物理学会の論文
1996-03-01