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无机材料学报

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一种新型湿化学方法合成Ba(Mg1/3Ta2/3)O3纳米粉末的研究

连芳; 徐利华; 王福明; 李文超   

  1. 北京科技大学材料科学与工程学院 北京 100083
  • 收稿日期:2001-04-02 修回日期:2001-06-06 出版日期:2002-03-20 网络出版日期:2002-03-20

A New Wet-Chemical Approach to Synthesis Ba(Mg1/3Ta2/3)O3 Nanometric Powder

LIAN Fang; XU Li-Hua; WANG Fu-Ming; LI Wen-Chao   

  1. Department of Inorganic Material; University of Science and Technology Beijing; Beijing 100083; China
  • Received:2001-04-02 Revised:2001-06-06 Published:2002-03-20 Online:2002-03-20

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摘要： 介绍了一种工艺简便且成本较低的Ｂａ（Ｍｇ１／３Ｔａ２／３）Ｏ３（ＢＭＴ）纳米粉末的湿化学制 备方法．实验过程以Ｔａ２Ｏ５作为起始物，通过热碱反应与钽离子浓度控制法合成Ｔａ２Ｏ５·ｎＨ２Ｏ 胶体，然后与Ｂａ、Ｍｇ醋酸盐按化学计量比混合，经热处理制得ＢＭＴ纳米粉末．实验结果表 明该方法制备ＢＭＴ粉体所需的合成温度仅为８００℃；比传统固相反应法合成温度降低４００℃ 左右，平均粒径仅为７０ｎｍ此外所制得的纳米陶瓷材料具有较佳的低温烧结性能和微波介电 特性，比目前报道的醇盐系湿化学制备技术更具有实用性．

关键词: Ba（Mg1/3Ta2/3）O3纳米粉, Ta2O5·nH2O胶体, 湿化学法, 微波介电特性

Abstract: This paper introduced an easily-controlled and lower-cost wet-chemical process for the synthesis of nanometric
Ba(Mg1/3Ta2/3)O3 (BMT) powder. Tantalum pentaoxide was dissolved in molten sodium hydroxide, forming gelatinous Ta2O5· nH2O at
appropriate pH value and concentration. Then it was mixed with barium acetate and magnesium acetate as a certain proportion, nanometric BMT powders were
finally prepared after heat treatment. Furthermore the experimental results have indicated that the heating temperature was only 800℃ for
getting better powders with the average particle size of 70nm, and it has successfully reduced near 400℃ compared with traditional solid-
reaction method. Also, the nano-ceramics prepared by BMT powder have low-temperature sinteribility and good microwave dielectric properties. So it
is more practical than the present wet-chemical method in alcohol salt system reported in existing literature.

Key words: Ba（Mg1/3Ta2/3）O3 nanometric powder, Ta2O5·nH2O colloid, wet-chemical process, microwave dielectric property

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