The distribution of oxygen and nitrogen impurities in diamond single crystals from a variety of origins and qualities was investigated using secondary ion mass spectrometry. A positive correlation between these impurities is observed over a wide concentration range. It is suggested that in diamonds oxygen is present not only in submicroscopic inclusions, but also as a lattice impurity. It appears that the presence of oxygen in a given crystal volume suppresses the IR-activity of nitrogen defects.
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Shiryaev et al. (2010) studied this question.
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