ZhETF, Vol. 144,
p. 1004 (November 2013)
(English translation - JETP,
Vol. 117, No. 5,
available online at www.springer.com
DETERMINATION OF THE MAGNETOELECTRIC COUPLING COEFFICIENT FROM TEMPERATURE DEPENDENCES OF THE DIELECTRIC PERMITTIVITY FOR MULTIFERROIC CERAMICS Bi5 Ti3 FeO15
Bartkowska J.A., Dercz J.
Received: January 22, 2013
In the multiferroic materials, the dielectric and magnetic properties are closely correlated through the coupling interaction between the ferroelectric and magnetic order. We attempted to determine the magnetoelectric coupling coefficient from the temperature dependences of the dielectric permittivity for multiferroic Bi5 Ti3 FeO15. Multiferroic ceramics Bi5 Ti3 FeO15 belong to materials of the Aurivillius-type structure. Multiferroic ceramics Bi5 Ti3 FeO15 was synthesized via sintering the Bi2 O3 and Fe2 O3 mixture and TiO2 oxides. The precursor material was ground in a high-energy attritorial mill for 5 hours. This material was obtained by a solid-state reaction process at T=1313 K. We investigated the temperature dependences of the dielectric permittivity for the different frequences. From the dielectric measurements, we determined the temperature of phase transition of the ferroelectric-to-paraelectric type at about 1013 K. Based on dielectric measurements and theoretical considerations, the values of the magnetoelectric coupling coefficient were specified.