Dielectric, magnetoelectric, structure, and dissipative properties and the M?ssbauer effect in PbFe_(1/2)Nb_(1/2)O_3 ceramics in wide frequency and temperature ranges

摘要

High-quality fine-grained ceramic samples of classical multiferroics PbFe_(1/2)Nb_(1/2)O_3 (PFN) were synthesized. Their dielectric, magnetoelectric, and magnetic characteristics, including the M?ssbauer effect, were measured over wide ranges of temperatures (10-1000 K) and field frequencies (from 25 Hz to 1 MHz). The temperature dependence of the dielectric loss exhibits a maximum between 150 and 170 K, likely due to magnetic ordering. The dependence of ε on the magnetic field displays an anomalous increase near the Curie temperature (370 K) that rises to 40% upon heating.