Synthesis and characterization of CaTiO3-(Sm,Nd)AlO3 microwave ceramics via sol–gel method

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• 作者：Xinye Yang (1)
  Xiaohui Wang (1)
  Ming Huang (2)
  Shaopeng Zhang (1)
  Longtu Li (1)
  
• 关键词：Microwave dielectric ceramic ; Sol–gel process ; Dielectric properties ; Phase transformation
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：69
• 期：1
• 页码：61-66
• 全文大小：1,018 KB
• 作者单位：Xinye Yang (1)
  Xiaohui Wang (1)
  Ming Huang (2)
  Shaopeng Zhang (1)
  Longtu Li (1)
  
  1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
  2. Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
  
• ISSN：1573-4846

文摘

0.65CaTiO3-.35Sm0.9Nd0.1AlO3 (CTSA) ceramic nanopowders were synthesized via sol–gel method using the ethylene diamine tetraacetic acid as a chelating agent. Thermal analysis, Fourier transform infrared spectroscopy and X-ray diffraction were used to character the decomposition of precursor and phase transformation process of derived oxide powders. Single phase and well-crystallized 0.65CaTiO3-.35Sm0.9Nd0.1AlO3 powders with particle size of 30-0?nm were obtained by calcination at 800?°C. Dense ceramic was successfully obtained from the ultrafine powders sintered at 1,325?°C, almost 100?°C lower than 1,415?°C required for conventional powders. Compared with those prepared by conventional solid-state method, the CTSA ceramics derived from sol to gel process sintered at a lower temperature showed better microwave dielectric properties of εr?~?39, Q?×?f over 50,000?GHz and small τf?~??.1?ppm/K.