溶胶-凝胶法制备Ba_xSr_(1-x)TiO_3热释电陶瓷材料  

Preparation of Ba_xSr_(l-x)TiO_3 Pyroelectric Ceramics by Sol-Gel Technique

作　　者：曾华荣[1] 霍翠凤 姚春华[1] 金绮华[1] 孙大志[1] 林盛卫[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》1999年第1期101-106,共6页Journal of Inorganic Materials

摘　　要：采用Sol－Gel工艺制备了不同组成Ba_xSr_(1-x)TiO_3（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^(-8)C／cm^2·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 preparedby 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 pointon compositions and the properties of the IR detection for the BST sample under dc bias werealso studied. The results showed that the synthetic temperature of BST powder is 930℃, which ismuch lower than that by the conventional solid-state reaction method, the BST powder obtainedhas a narrow distribution. The sintering temperature falls from 1380℃ to 1320℃, the overgrowthof the grain is constrained and the average grain size is -5m. The relative permittivity of theBST sample increases by 20% over that by the conventional processing, the minimum dissipationfaCtor measured is 0.0025, and the pyroelectric coefficient reaches at 20x 10(-8)C/cm2.K.

关 键 词：钛酸锶钡 红外探测 溶胶凝胶法 陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]