SPIN RESONANCE STUDIES OF DEFECTS IN MAGNESIUM OXIDE,
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 20, 1959
- Accession Number
- AD0612229
Entities
People
- J. H. E. Griffiths
- John E. Wertz
- John W. Orton
- Peteris Auzins
Organizations
- University of Minnesota