拓扑化学法制备棒状(KxNa1-x)NbO3粉体

人工晶体学报, 2011, 40(4): 911-916.

拓扑化学法制备棒状(KxNa1-x)NbO3粉体

李月明 ^1, , 刘虎 ^2, , 沈宗洋 ^3, , 王竹梅 ^4, , 洪燕 ^5, , 李润润 ^6, , 廖润华 ^7,

1.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

2.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

3.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

4.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

5.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

6.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

7.景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

关键词：熔盐法 , 拓扑化学反应法 , 铌酸钾钠

Topo-chemical Synthesis of Rod-like ( KxNa1-x ) NbO3 Particles

以Na2CO3、K2CO3、Nb2O5和KCl为原料,采用拓扑化学反应法合成出一维方向生长钙钛矿结构的棒状KxNa1-x NbO3 (KNN)粉体.首先采用熔盐法合成出棒状的前驱体K2Nb8O21晶体,系统研究了Nb2O5与KCl的起始质量比、合成温度对kNb8O21晶体显微结构和形貌的影响,研究发现当Nb2O5与KCl的质量比为3/8,850℃下保温3h可以获得长度为80～100 μm,直径为3～8 μm的棒状K2Nb8O21晶体,且晶体沿[100]方向生长；然后以棒状的前驱体K2Nb8O21为模板晶粒,采用拓扑化学反应法制备出棒状KNN晶体,研究了Na2 CO3的添加量、烧成温度和保温时间对棒状KNN晶体显微结构和形貌的影响.结果表明:添加过量10wt％的Na2CO3,在900℃下保温3h可以获得沿[001]方向生长的棒状KNN晶体,其中K/Na =47.31/52.69,接近1/1,其长度和宽度分别为30 ～ 50 μm和2～6 μm.

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