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无机材料学报

无机材料学报

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BaTiO3纳米粉体的制备和性能

栾伟玲; 高濂; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室; 上海200050
  • 收稿日期:1997-07-08 修回日期:1997-08-15 出版日期:1998-08-10 网络出版日期:1998-08-10

Preparation and Characterization of Nanocrystalline BaTiO3

LUAN Wei-Ling; GAO Lian; GUO Jing-Kun   

  1. State Key Laborotory on High Peformance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-07-08 Revised:1997-08-15 Published:1998-08-10 Online:1998-08-10

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摘要： 采用溶胶-凝胶和溶胶-沉淀的方法合成了立方相纳米BaTiO3粉体．溶胶-凝胶法制备的粉体平均粒径为19nm，颗粒分布均匀、含少量BaCO3．溶胶-沉淀法得到了纯BaTiO3粉，平均粒径为42nm，存在部分团聚．两种方法相比，溶胶-凝胶法的粉体烧结密度较高，介电性能较好．讨论了两种合成方法的晶粒形成机理及对材料微观结构和介电性能的影响．

关键词: 钛酸钡, 纳米材料, 溶胶-凝胶, 溶胶-沉淀

Abstract: Nanocrystallines of BaTiO3 with a cubic phase were synthesized by two methods, sol-gel method and sol-precipitation method. Powders
obtained by the sol-gel method was homogeneous and ultrafine (19nm), with a few amounts of BaCO3. Pure crystallines of BaTiO3 with larger
grain size of 42nm and some degrees of aggregates were obtained by the sol-precipitation method. The sol-gel powders had higher sintering
density and better dielectric property. Mechanisms for the evolution of crystalline BaTiO3 in the sol-gel and the sol-precipitation
methods were discussed in the context of microstructure and dielectric properties.

Key words: barium titanate, nano crystalline, sol-gel, sol-precipitation

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