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• 作者：Yanmin Huang (1)
  Danping Shi (1)
  Laijun Liu (1)
  Guizhong Li (1)
  Shaoying Zheng (1)
  Liang Fang (1)
  
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：114
• 期：3
• 页码：891-896
• 全文大小：1,518 KB
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• 作者单位：Yanmin Huang (1)
  Danping Shi (1)
  Laijun Liu (1)
  Guizhong Li (1)
  Shaoying Zheng (1)
  Liang Fang (1)
  
  1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China
  
• ISSN：1432-0630

文摘

Bi0.5Na0.5TiO3 (BNT)-doped BaFe0.5Nb0.5O3 (BFN) ceramics were synthesized by a two-step solid-state reaction. Temperature dependence of dielectric properties measured at different frequencies was investigated over broad temperature and frequency ranges. Impedance spectroscopy and universal dielectric response were employed to study the relaxation behavior and conductivity mechanism of the ceramics in a frequency range from 40 Hz to 100?MHz and a temperature range from 300?K to 800?K. The complex plane impedance data revealed the bulk and grain boundary contributions toward conductivity processes in the form of semicircular arcs. The high-temperature conductivity of ceramics is attributable to thermally activated second ionized oxygen vacancy.