无机材料学报

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有机凝胶法低温合成纳米SrxBa1-xNb2O6粉体

赵九蓬1; 李垚2; 强亮生1; 王彪2; 张贺新1   

  1. 1. 哈尔滨工业大学应用化学系, 哈尔滨 150001; 2. 哈尔滨工业大学复合材料研究所, 哈尔滨 150001
  • 收稿日期:2003-02-10 修回日期:2003-04-15 出版日期:2004-01-20 网络出版日期:2004-01-20

Low Temperature Preparation of Strontium Barium Niobate Powders by the Aqueous Organic Gel Method

ZHAO Jiu-Peng1; LI Yao2; QIANG Liang-Sheng1; WANG Biao2; ZHANG He-Xin1   

  1. 1.Department of Applied Chemistry; Harbin Institute of Technology; Harbin 150001; China; 2.Center for Composite Materials; China
  • Received:2003-02-10 Revised:2003-04-15 Published:2004-01-20 Online:2004-01-20

摘要: 以柠檬酸和乙二胺四乙酸为配位剂与金属离子配位,以水作为溶剂,采用有机凝胶法合成了纳米SrxBa1-xNb2O6(x=0.5)陶瓷粉体.以TG/DTA对金属羧酸盐凝胶的热分解历程进行了分析,以XRD分析了不同煅烧温度下所得产物的相组成.结果表明,在800℃下煅烧2h可获得单一四方钨青铜相SBN粉体.研究了溶液pH值和柠檬酸用量对Sr-Ba-Nb前驱体凝胶稳定性的影响.通过计算Sr-EDTA和Ba-EDTA配合物的条件形成常数Kcf及实验确定获得稳定Sr-Ba-Nb前驱体凝胶的最佳pH=8.

关键词: 铌酸锶钡陶瓷粉体, 有机凝胶法, 柠檬酸, pH值

Abstract: SrxBa1-xNb2O6(x=0.5) ceramic powders were synthesized by the aqueous organic gel routes. The desired
metal cations were chelated in a solution by using citric acid and ethylenediaminetertraacetic acid (EDTA) as the chelating agents. The
thermal decompostion of the metal carboxylate precursor gels was studied by TG/DTA and the products derived from calcinations of the gels at
different temperatures were characterized by XRD and TEM. The results reveal that tetragonal tungsten bronze-type structural SBN with fine
particle size can be achieved at 800℃. The influences of pH and molar ratio of citric acid: Nb cation on the formation of
homogeneous Sr-Ba-Nb precursor gels were also studied. pH=8 used during the preparation of Sr-Ba-Nb precursor gels was determined
by calculation of the conditional formation constant Kcf of Sr-EDTA and Ba-EDTA complexes.

Key words: strontium barium niobate ceramic powders, organic gel method, citric acid, pH value

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