Influence of the Sintering Temperature on the Structure and Dielectric Properties of Magnetoelectric Composites

摘要

Magnetoelectric composites were prepared by conventional ceramic technology. It was found that structural modulation in the perovskite phase appears at higher sintering temperatures (1220 °C) and in the spinel phase at lower ones (1180 °C). It is suggested that the observed structure modulation of the perovskite and spinel phases may be associated with a defect subsystem, in particular with crystallographic shear planes. It is shown that increasing of the sintering temperature of the composite from 1180 to 1220 °C leads to high dielectric permittivity (almost the entire temperature range) and tan δ (T> 300 °C).