Abstract
The shear modulus and internal friction in polycrystalline manganese-zinc ferrite are measured as a function of temperature between 20 and 500 °C, by using a torsion inverted pendulum. Curves of modulus versus temperature show a phase transition near the Curie temperature ( T C). Three internal friction peaks R 1, R 2 and R 3 are observed on the curves of internal friction versus temperature. The peak R 1 in ferrimagnetic state is discussed in interaction of domain walls with point defects. The peak R 2 below the T C is attributed to viscous motion of domain walls. The peak R 3 could be ascribed to the exchange of cations and their vacancies, and clustering Mn 3+ ions on octahedral sites.
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