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分析比较了三种工艺对制备纳米Ba0.5Sr0.5TiO3(BST55)粉体的影响,得到了优化的聚合物前驱体法制备工艺。并利用TG-DSC、IR、XRD、SEM分析了BST55干凝胶的热分解过程、化学组成、物相变化以及形貌。实验结果表明,加入适量的乙烯基三乙氧基硅烷偶联剂(TM-12)能改善BST55粒子的粒度及聚集形态;先采用聚合物前驱体法制备BST55/PMMA复合材料干凝胶,然后在700℃煅烧可形成粒径介于80～100nm之间的BST55粒子。
The effects of three processes on the preparation of nanosized Ba0.5Sr0.5TiO3 (BST55) powders were analyzed and compared. The optimized preparation process of polymer precursors was obtained. The thermal decomposition process, chemical composition, phase transformation and morphology of BST55 xerogel were analyzed by TG-DSC, IR, XRD and SEM. The experimental results show that the addition of the appropriate amount of vinyl triethoxysilane coupling agent (TM-12) can improve the particle size and aggregate morphology of BST55 particles; first prepared by polymer precursor BST55 / PMMA composite xerogel, and then Calcined at 700 ° C to form BST55 particles with particle sizes between 80 and 100 nm.