Abstract
Internal friction Q—1 of Mn–Zn spinel ferrites in the manganese-rich region, developed for their use as TV deflection coil yokes, has been studied in the temperature range from 300 to 630 K. Two distinct stress induced relaxation peaks have been observed in the internal friction versus temperature curves. The magnetic transition has been observed to change with the concentration of zinc. The effect of magnetic field on the temperature dependence of internal friction has also been studied. The increase of zinc content in this system drastically alters the acoustic relaxations. The results are discussed in the light of Jahn-Teller distortion and cationic exchange between octahedral and tetrahedral sublattices and clustering of octahedral Mn3+ ions.
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