摘要
采用新型的Sol-gel工艺制备了Ba0．6Sr0．4TiO3（BST）超细粉体，将BST粉体进行压制和烧结，获得了晶粒尺寸在1μm以内的BST陶瓷块体。观察了BST陶瓷块体的结晶情况并测定了其电学性能。在Sol—gel工艺中，加入了有机大分子量聚乙烯吡咯烷酮（polyvinyl pyrrolidone，PVP）制备BST前驱体。实验结果表明：PVP的加入可有效增加前驱体的稳定性和分散性，降低BST陶瓷的预烧温度约250℃，并在1200℃获得晶粒细小、致密的BST陶瓷。BST陶瓷，显示弥散相变特征。
The ultra-fine powder of Ba0.6 Sr0.4TiO2 （BST）is fabricated by a new Sol-gel method and sintering. The BST ceramic with fine grains（-1μm）can be obtained. Their crystallization and electrical properties are investigated. In this new Sol-gel method, higher-molecular-weight PVP is more effective in increasing the stability and dispersivity of the BST procedure. The experimental results show that the calcining temperature of Sol-gel derived powder could be lowered about 250℃ ,dense ceramic with homogeneous grain size is obstained at 1200℃, good electric properties and obvious characteristics of diffused phase transition.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2005年第F11期326-327,337,共3页
Materials Reports
基金
国家“973”计划（2002CB613304）资助
关键词
SOL-GEL法
BST
介电特性
弥散相变
sol-gel process, BST, dielectric properties, diffused phase transition
作者简介
张红芳：E-mail：zhanghongfang@fmrl．ac．cn
