Tripathy, Satya Narayan and Mishra, B G and Shirolkar, Mandar M and Sen, S and Das, Suprem R and Janes, David B and Pradhan, Dillip K (2013) Structural, microstructural and magneto-electric properties of single-phase BiFeO3 nanoceramics prepared by auto-combustion method. Materials Chemistry and Physics, 141 (1). pp. 423-431. ISSN 0254-0584

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Polycrystalline nano BiFeO3 powders were synthesized by auto-combustion method using urea as fuel and metal nitrates (Fe(NO3)(3).9H(2)O, Bi(NO3)(3)-5H(2)O) as oxidizers. In order to optimize the single-phase synthesis condition of BiFeO3, different fuel to oxidizer ratios have been investigated. The preliminary structural investigation using X-ray diffraction shows the samples were of single phase and crystallize in rhombohedral structure (R3c). The ferroelectric and antiferromagnetic ordering temperatures of BiFeO3 were found to be 832 degrees C and 364 degrees C respectively, from differential thermal analysis. The temperature dependent dielectric study shows an anomaly around 215 degrees C which corresponds to magneto-electric coupling in the material. Field-emission scanning electron micrographs show effect of fuel to oxidizer ratio on grain size evolution. The ferroelectric hysteresis loops for all the samples were measured at a frequency of 100 Hz confirming the ferroelectric nature. An evidence of magneto-electric coupling was also observed at room temperature from magneto-capacitance measurements. (C) 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Environment and Pollution
Divisions: Sensor and Actuator
Depositing User: Bidhan Chaudhuri
Date Deposited: 27 Sep 2013 09:27
Last Modified: 27 Sep 2013 09:27

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