Abstract
An electronic mechanism of the acoustic loss peak in magnetite which has been observed below 114°K is proposed. Cation vacancies play the principal role in this mechanism and just half of the vacancies can contribute to the loss. When the vacancy is located on a Fe 3+ linkage of the Verwey ordering, four Fe 3+ ions around the vacancy become equivalent and one extra electron has to be located on one of them. The electron transfers among the four ions easily by the effect of strain or the change in the direction of magnetization and it introduces slow relaxation phenomena.
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