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SPIN RESONANCE STUDIES OF DEFECTS IN MAGNESIUM OXIDE,
MINNESOTA UNIV MINNEAPOLIS
Excluding impurities, trapped holes are the most important defect centres which are observable by electronspin resonance in presently-available magnesium oxide crystals. Models are suggested for two types of trapped hole centres. The first, involving one hole, is believed to involve the following linear array hole trapped on an oxygen atom-positive ion vacancy-normal O-2 iontrivalent impurity ion. The second centre, which is far less stable, involves two holes opposite one another about a positive-ion vacancy. It is suggested that another defect is associated with this pair to cause localization of the axis of symmetry. These conclusions are drawn from electronspin resonance spectra showing simple axial symmetry for single-hole centres lying along principal crystal axes. For hole-pair centres one observes pairs of lines approximately centred upon the positions of the previously-mentioned axial lines. More complex hole centre spectra have also been observed. Author
Pub. in Faraday Society. Discussions (Gt. Brit.) n28 p136-41 1959 (Copies available only to DDC users).
AF18 600 479