Abstract
NATURAL type IB diamond has an anomalously low thermal conductivity. To investigate this we have carried out birefringence, infrared and ultraviolet absorption spectroscopy, electron spin resonance and transmission electron microscopy (TEM) experiments. We suggest here that the low IB thermal conductivity is due to the presence of previously unknown defects in this type of diamond. It is also suggested that these defects are related to the more common ‘platelets’ or planar faults which are found in type IA diamond.
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