高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (10): 1930.

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局部化学法合成K0.5Bi0.5TiO3片状晶粒及其反应机理研究

张阳红1,2, 曾江涛1, 李国荣1, 郑嘹赢1, 殷庆瑞1   

  1. 1. 中国科学院上海硅酸盐研究所, 上海200050;
    2. 中国科学院研究生院, 北京100049
  • 收稿日期:2008-11-07 出版日期:2009-10-10 发布日期:2009-10-10
  • 通讯作者: 曾江涛, 男, 博士, 助理研究员, 主要从事功能陶瓷材料与器件研究. E-mail: zjt@mail.sic.ac.cn
  • 基金资助:

    国家“九七三”计划(批准号: 2009CB623305)及国家自然科学基金(批准号: 50702068, 50675218)资助.

Synthesis of Plate-like K0.5Bi0.5TiO3 Particles by Topochemical Method

ZHANG Yang-Hong1,2, ZENG Jiang-Tao1*, LI Guo-Rong1, ZHENG Liao-Ying1, YIN Qing-Rui1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-11-07 Online:2009-10-10 Published:2009-10-10
  • Contact: ZENG Jiang-Tao. E-mail: zjt@mail.sic.ac.cn
  • Supported by:

    国家“九七三”计划(批准号: 2009CB623305)及国家自然科学基金(批准号: 50702068, 50675218)资助.

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摘要：

以含铋层状Bi4Ti3O12(BIT)晶粒作为反应前驱体, 通过熔盐环境下的局部化学反应法制备了片状钛酸铋钾(K0.5Bi0.5TiO3, KBT)陶瓷粉体晶粒. 分析结果表明, 所制备的KBT陶瓷晶粒平均直径约为15～20 μm, 厚度小于2 μm. 分析了由含铋层状型BIT向钙钛矿型KBT片晶转化的形成机制, 并讨论了反应路径对最终产物形貌的影响规律.

关键词: 部化学法; 钙钛矿; 各向异性; 钛酸铋钾

Abstract:

Plate-like K0.5Bi0.5TiO3 particles were successfully fabricated by topochemical method from bismuth layer-structured ferroelectric (BLSF) Bi4Ti3O12. Owing to its highly anisotropic structure, plate-like Bi4Ti3O12 was firstly synthesized in the KCl flux. The plate-like Bi4Ti3O12 was reacted with the complementary K2CO3 and TiO2, finally transformed to perovskite K0.5Bi0.5TiO3 particles and maintained its morphology nearly unchanged. Our result suggested the size of the plate-like particles is 15—20 μm in length and 2 μm in thickness. The mechanism of the reaction was analyzed according to the results. The KBT particles prepared in this experiment can be used as the template to prepare textured (Na, K)0.5Bi0.5TiO3 ceramics by (Reactive) Template Grain Growth method, inducing the grain orientation and thus enhance the properties.

Key words: Topochemical method; Perovskite; Anisotropic; K0.5Bi0.5TiO3

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