Journal
MATERIALS SCIENCE-POLAND
Volume 31, Issue 2, Pages 221-225Publisher
SCIENDO
DOI: 10.2478/s13536-012-0088-y
Keywords
BiFeO3 ceramics; solution combustion method; X-ray diffraction; ferroelectric properties; dielectric properties
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Funding
- UGC-SAP, Phase II
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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 degrees 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 epsilon and dielectric loss tan delta 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.
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