通过溶胶-沉淀法制备出完全钙钛矿结构的 Ba0.71Sr0.29TiO3( BST)粉末,粉末的颗粒尺寸约为 300 nm.但得到的 BST粉末不稳定,在乙酸中容易分解.通过 TG- DTA和 XRD分析,直接沉淀得 到的粉末颗粒失重大,而且由于颗粒所吸附的有机物阻碍了 Ba2+和 Sr2+的扩散,造成了直接沉淀的 BST颗粒内部的组分不均匀和结晶不完全.通过对直接沉淀的 BST粉末进行 150- 200 ℃的水热 后处理,其结晶性得到了很大的改善,稳定性也得到了提高.实验表明,水热处理具有与烧结相似 的效果,但 BST粉末的分散性得到了改善.
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