Dielectric study at microwave frequencies of phase transitions in multiferroic ceramics

Materials Research

B. Fraygola²  Adelino A. Coelho¹  J. A. Eiras² 

[1] ,Universidade Federal de São Carlos Departamento de Física São Carlos SP ,Brasil

关键词: multiferroic;    lead iron tungstate;    microwave dielectric spectroscopy;    phase transitions;   

DOI  :  10.1590/S1516-14392013005000113

来源: SciELO

【 摘 要 】

Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and "normal" ferroelectric PbTiO3 (PT) - PFW-PT have been synthesized by a modified B-site precursor method and characterized by microwave dielectric measurements. A dielectric dispersion occurring in the frequency range of 100MHz-3GHz and in a broad range of temperatures showed to be a powerful tool to detect electrostrictive and magnetostrictive effects. Anomalies in the temperature dependence of the dielectric parameters (fR (characteristic frequency) and the dielectric strength Δε (characteristic of the dispersion)) have been observed at T N and T C for all samples, indicating that the coupling between the ferroelectric and antiferromagnetic orders occurs "via strain" and confirming the high sensitivity of microwave dielectric measurements to probe weak transitions in bulk ceramics.

【 授权许可】

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