Magnetic ordering and instability investigation of multiferroic Pb(Fe2/3W1/3)O3 ceramics by microwave dielectric spectroscopy |
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Authors: | B Fraygola AA Coelho |
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Institution: | a Universidade Federal de São Carlos, Depto de Física, Grupo de Cerâmicas Ferroelétricas (GCFerr), São Carlos, SP, Brazilb Universidade de Campinas, LPCM - DFA, IFGW, Campinas, SP, Brazil |
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Abstract: | The microwave dielectric and magnetic properties of Pb(Fe2/3W1/3)O3 multiferroic ceramics were investigated. A dielectric dispersion occurring in the frequency range 100 MHz-3 GHz and in a broad temperature range showed itself to be a powerful tool to detect magnetostrictive effects. The experimental results revealed the following remarkable features: the temperature dependence of fR (characteristic frequency) and the dielectric strength Δε (characteristic of the dispersion) enabled us to identify not only the para-ferroelectric (TC≈180 K) but also the para-antiferromagnetic (TN≈340 K) phase transitions, while magnetic measurements revealed the para-antiferromagnetic ordering and a weak superexchange interaction (TN2∼15 K). Additionally, both characterizations confirmed the existence of structural or magnetic instabilities around 250 K. |
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Keywords: | A Multiferroics A Lead iron tungstate D Microwave dielectric spectroscopy D Phase transitions |
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