摘要
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300nm。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。
Barium strontium titanate (Ba0.71Sr0.29TiO3) powders were prepared by solution-precipitation method. The BST powders are single perovskite phase with particle size of about 300 nm. The newly precipitated powders are instable and poorly crystallized. TG-DTA analysis proves that the BST powders have a loose structure due to absorbed organic compounds, which also cause the inhomogeneity in a single particle. Hydrothermal treatments at 150-200°C were conducted for the BST powders, and the hydrothermally treated BST powders have better crystallization and smaller weight loss.
出处
《功能材料与器件学报》
EI
CAS
CSCD
北大核心
2005年第1期47-52,共6页
Journal of Functional Materials and Devices
基金
国家自然科学基金资助项目(No.60306011)
关键词
BST
粉末
溶胶-沉淀法
水热处理
结晶
BST
powders
solution-precipitation method
hydrothermal treatment
crystallization
