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Low‐Temperature Magnetic and Dielectric Anomalies in Rare‐Earth‐Substituted BiFeO 3 Ceramics
Author(s) -
Koval Vladimir,
Skorvanek Ivan,
Yan Haixue
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13328
Subject(s) - orthoferrite , thermomagnetic convection , materials science , dielectric , magnetization , condensed matter physics , ceramic , dielectric loss , impurity , nuclear magnetic resonance , magnetic field , composite material , chemistry , organic chemistry , quantum mechanics , physics , optoelectronics
In this work, we report on the magnetic and dielectric anomalies observed in dense Bi 1– x RE x FeO 3 ceramics ( RE = Dy , Tb ; 0 ≤ x ≤ 0.3) at cryogenic temperatures. For compositions with a high content of rare‐earth ions, thermomagnetic experiments revealed a distinct anomaly in the magnetization curves at temperatures below 200 K. The temperature of the magnetic anomaly along with a thermal hysteresis was found to be dependent on the rare‐earth concentration and magnetic field strength. Low‐temperature dielectric measurements showed an anomalous relaxor‐like behavior of the relative permittivity and dielectric loss in highly doped ceramic samples. The anomalies in low‐temperature magnetization and dielectric response are suggested to result from the presence of GdFeO 3 ‐like orthoferrite phase and/or bismuth rare‐earth‐mixed iron garnet impurities.