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Title: Origin of giant dielectric constant and magnetodielectric study in Ba(Fe0.5Nb0.5)O3 nanoceramics
Authors: Patel P.K.
Yadav, Kamlesh Kumar
Singh H.
Yadav A.K.
Published in: Journal of Alloys and Compounds
Abstract: Lead free Ba(Fe0.5Nb0.5)O3 (BFN) ceramics were synthesized by sol-gel method. X-ray diffraction pattern of the samples at room temperature shows a monoclinic structure. The influence of sintering temperature on microstructure and dielectric properties of BFN ceramics were analysed. Microstructure analysis shows well-grown and dense microstructure in 1200 C sintered sample exhibiting enhanced dielectric and magnetodielectric properties. We report a very high dielectric constant (∼33,000) with low dielectric loss (∼0.45) at room temperature for 1200 C sintered sample at 100 Hz frequency. Cole-Cole plot shows that the grain boundary effect (barrier layer formation) is responsible for such a high value of dielectric constant. The sample was also analyzed by Fe K-edge X-ray absorption near-edge structure spectroscopy to obtain the Fe oxidation state. This analysis confirms that Fe ions in BFN ceramics are in mixed valance state (Fe2+/Fe 3+). Another interesting feature of BFN ceramics is the appearance of room temperature high magnetodielectric response (3.8%) at 7 kOe magnetic field and 100 Hz frequency. © 2013 Elsevier B.V. All rights reserved.
Citation: Journal of Alloys and Compounds (2014), 591(): 224-229
Issue Date: 2014
Keywords: Ceramic
Dielectric response
Grain boundaries
Sol-gel processes
ISSN: 9258388
Author Scopus IDs: 57198995172
Author Affiliations: Patel, P.K., Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
Yadav, K.L., Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
Singh, H., Indus Synchrotrons Utilization Division, Raja Ramanna Center for Advanced Technology, Indore 452013, India
Yadav, A.K., Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400088, India
Funding Details: We thank to the Council of Scientific and Industrial Research, New Delhi, India for financial support under the project Grant Number 03 (1156)/10/EMR II dated 26-04-2010. One of the authors Piyush Kumar Patel would like to acknowledge MHRD for providing the fellowship.
Corresponding Author: Yadav, K.L.; Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India; email:
Appears in Collections:Journal Publications [PH]

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