一种新型湿化学方法合成Ba(Mg_(1/3)Ta_(2/3))O_3纳米粉末的研究

A New Wet-Chemical Approach to Synthesis Ba(Mg_(1/3)Ta_(2/3))O_3 Nanometric Powder

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．

This paper introduced an easily- controlled and lower-cost wet-chemical process for the synthesis of nanometric Ba(Mgl/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.