Effects of Heat Treatment on Ultrasonic Attenuation in Mn-Ferrites
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Acoustic losses in single crystals of Mn-ferrite were studied in the temperature range of 180-650 K. Loss peaks were observed at 232 and 537 K with activation energies of 0.3 and 0.8 eV, respectively. The 232 K peak arises from the relaxation of electrons between cations on octahedral sites. The 537 K peak is ascribed to the exchange of cations and their vacancies on octahedral sites. A small peak was observed at around 290 K after a heat treatment in reducing atmosphere. Heat treatments at 300 and 600℃ affect the oxygen stoichiometry and the distribution of cations between octahedral and tetrahedral sites.
- 社団法人応用物理学会の論文
- 1997-05-30
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