Ceramics-Silikáty 58, (1) 65 - 69 (2014) |
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SYNTHESIS AND CHARACTERIZATIONS OF PURE AND DOPED NANOCRYSTALLINE BiFeO3 CERAMICS BY SHS
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Chaudhari Yogesh A. 1, Mahajan Chandrashekhar M. 2, Bendre Subhash T. 3
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1 Department of Physics, Shri. Pancham Khemraj Mahavidyalaya, Sawantwadi-416 510 (M.S.)
(Affiliated to Mumbai University) India
2 Department of Engineering Sciences and Humanities (DESH),
Vishwakarma Institute of Technology (VIT), Pune - 410 405 (M.S) India
3 Department of Physics, School of Physical Sciences,
North Maharashtra University, Jalgaon - 425 001 (M.S) India
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Keywords: BiFeO3 Ceramics, SHS, XRD, Ferroelectrics, Multiferroics, Dielectrics
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The pure and Zn incorporated BiFeO3 ceramics were synthesized by self-propagating high temperature synthesis (SHS).
The X-ray diffractometer (XRD) studies revealed that, both BiFeO3 and BiFe0.95Zn0.05O3 ceramics crystallizes in a single
phase rhombhohedral structure. The room temperature ferroelectric and magnetic hysteresis loop evidenced coexistence of
ferroelectricity and magnetism in single phase undoped and Zn doped BiFeO3. The M-H hysteresis loop of BiFe0.95Zn0.05O3
sample demonstrated a weak ferromagnetism at 300 K and 5 K respectively. The room temperature ferroelectric P-E hysteresis
loops of BiFeO3 and BiFe0.95Zn0.05O3 exhibited an unsaturated behavior and suggests a partial reversal of polarization. A
variation of dielectric constant with respect to temperature in BiFeO3 and BiFe0.95Zn0.05O3 ceramic delivers a dielectric
anomaly around 480 and 450oC which is a consequence of antiferromagnetic to paramagnetic phase transition (TN).
Moreover, for BiFeO3 the anomaly manifests a possible coupling between electric and magnetic dipole moments. |
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