Citrate route to ultra-fine barium polytitanates with microwave dielectric properties
Citrate route to ultra-fine barium polytitanates with microwave dielectric properties
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DOI：
10.1039/jm9950500057
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发表时间：
1995
影响因子：
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通讯作者：
J. Choy;Yang-Su Han;Jin-Tai Kim;Yoonho Kim
中科院分区：
文献类型：
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作者：
J. Choy;Yang-Su Han;Jin-Tai Kim;Yoonho Kim
通过柠檬酸盐途径制备了粒径为 30–50 nm 的高反应性超细聚钛酸钡 (BaO-nTiO2, n= 4, 4.5, 5)。计算了 BaCO3-柠檬酸-H2O 和 TiO(OH)2-柠檬酸-H2O2-H2O 体系在 25 °C 下的溶解度等温线，以预测制备纯且稳定的柠檬酸盐复合物的最佳 pH 条件。通过在相对较低的温度下对最佳制备的柠檬酸盐前体进行热分解，可以获得具有单分散纳米尺寸颗粒的纯且结晶良好的粉末。描述了柠檬酸盐衍生的聚钛酸钡的结晶过程和颗粒特征的细节。还测量了 BaTi4O9 和 Ba2Ti9O20 的可烧结性和微波介电性能并进行了简要讨论。
Highly reactive and ultra-fine barium polytitanates (BaO-nTiO2, n= 4, 4.5, 5) with a particle size of 30–50 nm have been prepared by the citrate route. Solubility isotherms were calculated for the BaCO3-citric acid-H2O and TiO(OH)2-citric acid-H2O2-H2O systems at 25 °C to predict the optimum pH condition for preparing pure and stable citrate complexes. Pure and well crystallized powders with monodispersive, nanometer-sized particles could be obtained by thermal decomposition of the optimally prepared citrate precursors at relatively low temperatures. Details of the crystallization process and particle characteristics of citrate-derived barium polytitanates are described. The sinterability and microwave dielectric properties of BaTi4O9 and Ba2Ti9O20 were also measured and are discussed briefly.