Dielectric characteristics of B-site-modified hexagonal-barium titanate

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• 作者：Fuyun Li ; Min Zeng ; Hongtao Yu ; Hui Xu…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：27
• 期：3
• 页码：2836-2840
• 全文大小：1,239 KB
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• 作者单位：Fuyun Li (1)
  Min Zeng (1)
  Hongtao Yu (1)
  Hui Xu (1)
  Jing Li (1)
  
  1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1573-482X

文摘

Cr, Sb co-substituted hexagonal BaTiO₃ perovskite ceramics with a composition of BaTi_1−2xCr_xSb_xO₃ (x = 0–0.2) were synthesized via the conventional solid-state reaction method. Their structures transitioned from tetragonal (x = 0) with space group P4 mm to hexagonal (x = 0.1) with space group P63/mmc and finally to hexagonal containing impurities (X = 0.2). The refinement results of the sample (x = 0.1) revealed that it is possible to stabilize the hexagonal polymorph of BaTiO₃ at room temperature by the partial replacement of Ti4+ with Cr3+ and Sb5+. Moreover, the structural changes of BaTiO₃ depend on sintering method and temperature of sintering. The ceramic dielectric properties were studied, and the results showed that with increased doping, the ceramic dielectric constant gradually decreased. All ceramics materials with a composition of BaTi_1−2xCr_xSb_xO₃ (x ≥ 0.075) are dielectric insulators at room temperature with permittivity values between 30 and 60.