【摘要】 在分析Ｂａ^２＋、ＴｉＯ^２＋与草酸混合体系热力学平衡的基础上，提出了将ＴｉＯ^２＋与草酸混合，在一定的ｐＨ值时生成钛配阴离子，再与ＢａＣｌ_２进行复分解反应，直接沉淀出ＢａＴｉＯ_３的前驱体－草酸氧钛钡，最终经煅烧得ＢａＴｉＯ_３粉体的合成新工艺。用化学分析法及Ｘ荧光法对ＢａＴｉＯ_３的Ｂａ／ｒｉ比及有害杂质进行了分析；用ＸＲＤ、ＴＥＭ对ＢａＴｉＯ_３的晶型、粒径及形貌进行了表征。结果显示：用该工艺所合成的ＢａＴｉＯ_３粉体纯度高、粒径小，经正电阻温度系数元件（简称ＰＴＣ）及多层陶瓷电容器应用试验均显示出优良的性能。更多还原

【Abstract】 A new process for preparing barium titanyl oxalate tetrahydrate was proposed on the basis of analyzing the thermodynamic equilibrium of mixed system of Ba2+,TiO2+ and oxalate.The complex[ TiO (C2O4)2]2-was formed by mixing TiO2+ and oxalate with the pH value of the solution controlled.The precursor of BaTiO3 was prepared by the complex-decomposition of the mixing product of BaCl2 and complex ion.BaTiO3 powder was obtained by calcining the precursor.The Ba/Ti ratio and harmful impurity of BaTiO3 was analyzed by the methods of chemical analysis and X-fluorescence spectrum.The crystal structure,particle size and morphology of the BaTiO3 are characterized by XRD,TEM,etc.,The results showed that the BaTiO3 powder obtained from the process is in higher purity, small pariticle and narrow size distribution.The product exhibited fine properties when applying to PTC component and layered capacity.更多还原