Abstract
The acoustic losses in single crystals of titanomagnetite (Fe3-xTixO4 in the composition range 0.2≤x≤1) have been studied in the temperature range of 130–520 K by applying longitudinal vibrations of 130, 150 and 200 kHz. Loss peaks were observed in the vicinity of 140, 190 and 480 K with activation energies of 0.08, 0.16 and 0.83 eV, respectively. Two peaks at 140 and 190 K are regarded as stress-induced relaxations of electrons between iron ions on octahedral sites: the first one by hopping between Fe ions and the second one by hopping between Fe2+ and Fe3+ ions with a Ti4+ ion as nearest neighbor. The peak at 480 K is ascribed to the exchange motion of Fe and/or Ti ions and their vacancies on octahedral sites.
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