@inproceedings{4e60c97a6e3841278ed8d9c7a8d7195a,
title = "Effect of heat treatment on the ultrasonic attenuation on Mn-ferrites",
abstract = "The acoustic losses in single crystals of manganese ferrites were studied in the temperature range from 180 to 650 K by applying longitudinal vibrations of 150 kHz. Loss peaks were observed at 232 and 537 K with activation energies of 0.3 and 0.8 eV, respectively. The first loss peak at 232 K is regarded as a stress-induced relaxation of electrons between two and three-valent ions. The second peak at 537 K is ascribed to the exchange motion of iron cations and their vacancies on octahedral sites. Heat treatments at 300 and 600°C affect the oxygen stoichiometry and distribution of cations between octahedral and tetrahedral sites which results in the changes of the loss peaks magnitudes.",
author = "Y. Kawai and V.A.M. Brabers and Z. Simsa",
year = "1997",
doi = "10.1051/jp4:1997184",
language = "English",
series = "Journal de Physique IV, Colloque",
pages = "223--224",
booktitle = "7th International Conference on Ferrites, Bordeaux",
note = "conference; 7th International Conference on Ferrites ; Conference date: 01-01-1997",
}