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1 2013

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Ferroelectric and dielectric properties of nanocrystalline BiFeO3 multiferroic ceramics synthesized by solution combustion method (SCM)

Chaudhari Y. A., Mahajan C. M., Abuassaj E. M., Jagtap P. P., Patil P. B., Bendre S. T.

Materials Science Poland

2013

Vol. 31, No. 2

221--225

Nanocrystalline multiferroic BiFeO3 ceramics was prepared by a novel solution combustion method (SCM). The X-ray diffraction (XRD) studies on structural properties of the synthesized ceramics reveal that the BiFeO3 ceramics has rhombhohedral perovskite structure with an average crystallite size of 15 nm. The ferroelectric P-E hysteresis loop measurement at room temperature shows unsaturated behavior with a partial reversal of polarization. Investigations on temperature dependence of dielectric constant in BiFeO3 demonstrate a clear dielectric anomaly at approximately around 380 C, which corresponds to antiferromagnetic to paramagnetic phase transition (TN) and also evidences a possible coupling among the electric and magnetic dipoles of BiFeO3. A room temperature variation of dielectric constant “e” and dielectric loss “tan d” as a function of frequency in the range of 100 Hz – 1 MHz, confirms that both dielectric constant and loss are strong functions of frequency.