采用Sol－Gel工艺制备了不同组成BaxSr1-xTiO3（BST）粉体，利用FT－IR、DTA、XRD等技术分析了溶胶-凝胶反应转变机理及凝胶热处理过程中的相结构变化情况，同时对材料的烧结条件及材料的居里温度与其组成关系进行了研究．结果表明：获得的BST粉体颗粒度较细，其合成温度及烧结温度分别为930℃及1320℃，均低于传统工艺的相应温度；BST烧结体的晶粒尺寸从10μm降低到5μm；各组成的介电常数均有较大的提高，平均约提高20％左右；最低损耗值可达0．0025；材料的热释电系数值可达到20×10-8C／cm2·K，比常用热释电陶瓷材料高出4倍以上．
The BaxSr1-xTiO3 (BST) materials of various compositions (x=0.75,0.70,0.60) were prepared by sol-gel processing.
The reaction mechanism was investigated by FT-IR technique. The thermolysis process of the BST-gel was analyzed by DTA and XRD. The dependence of Curie point on compositions
and the properties of the IR detection for the BST sample under dc bias were also studied. The results showed that the synthetic
temperature of BST powder is 930℃, which is much lower than that by the conventional solid-state reaction method, the BST powder
obtained has a narrow distribution. The sintering temperature falls from 1380℃ to 1320℃, the overgrowth of the grain is constrained
and the average grain size is ～5μm. The relative permittivity of the BST sample increases by 20% over that by the conventional
processing, the minimum dissipation factor measured is 0.0025, and the pyroelectric coefficient reaches at 20×10-8C/cm2·K.
参考文献
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