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

DOI: 10.7868/S0044451013110114

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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.