高纯超细BaTiO_3前驱体的热解机理及动力学

Study on the Thermal Decomposition Mechanism and Reaction Kinetics of the Precursor of Ultrafine BaTiO_3 with High Purity

采用ＦＴ－ＩＲ、ＸＲＤ技术，检测ＢａＴｉＯ＿３前驱体在不同温度下热解产物的组分、结构、晶型的变化规律，研究其热解机理。根据Ｂｒｏｉｄｏ线性化图解求动力学参数的方法，对三段热解过程动力学参数进行计算。由热解机理和动力学参数，优化热处理工艺条件所得的ＢａＴｉＯ＿３粉体粒度小，比表面大，近似球形，是电子陶瓷的优质瓷料。

The thermal decomposition mechanism is studied by using FT-IR,XRD to followthe process of thermal decomposition of the precursor of BaTiO_3 at the differental temperature.The kinetic parameters of the three steps of the process are calculated according to the Broidomethods of linearization. The conditions of the process of thermal treatment are optimized ac-cording to thermal decomposition mechanism and kinetic parameters. The powder obtained is ofnearly spherical morphology,small particle size and large specific area which is good electronic ce-ramic powder.