Some electron spin resonance properties of heat treated synthetic diamond

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Abstract
Three distinct and known E.S.R. spectra, which are obtained from five commercially available types of synthetic diamond, are discussed. The resonances are due to dispersed substitutional nitrogen, small aggregates and dispersions of ferromagnetic additive. Heat treatment in vacuo at 1200°c causes the migration of a significant amount of the additive from the interior to the surface but does not markedly affect the E.S.R. properties. Heat treatment in vacuo at 1500°c removes larger quantities of the additive and also that resonance which may reasonably be attributed to the small aggregates of additive. An additional line is observed at the free-spin g-value. In a certain selection of heated stones the line width of the nitrogen resonance is narrowed to 3 oe and the symmetry properties of the resonance may be studied more precisely. The behaviour of perfect octahedral stones does not appear to correspond in all respects to that of the common cubo-octahedral diamond. The appearance and mechanical properties of heated stones are also discussed.

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