期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 591, 期 -, 页码 224-229出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.12.119
关键词
Ceramic; Sol-gel processes; Dielectric response; Grain boundaries; XANES
资金
- Council of Scientific and Industrial Research, New Delhi, India [03 (1156)/10/EMR II]
- MHRD
Lead free Ba(Fe0.5Nb0.5)O-3 (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 degrees C sintered sample exhibiting enhanced dielectric and magnetodielectric properties. We report a very high dielectric constant (similar to 33,000) with low dielectric loss (similar to 0.45) at room temperature for 1200 degrees 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+/Fe3+). 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. (C) 2013 Elsevier B. V. All rights reserved.
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