微波烧结制备钛酸锶钡红外探测器材料

Microwave sintering preparation of barium strontium titanate used as infrared detector materials

以乙酸盐为原料,聚乙烯吡咯烷酮(PVP)为稳定剂,采用sol-gel法制备了Mn掺杂Ba0.6Sr0.4TiO3(BST)凝胶,分析了凝胶的热演化过程,分别用传统烧结和微波烧结技术制备BST纳米粉体。与传统烧结相比,900℃微波烧结0.5h即可合成纯钙钛矿相BST粉体,相同烧结温度下所需时间缩短3/4,有效控制晶粒长大,粉体粒径约60nm。采用该粉体制备的BST厚膜材料,εm>1000,tanδ<0.02,弥散指数降低,是制备大阵列非制冷红外焦平面阵列(UFPA)的优选材料。

Mn doped Ba0.6Sr0.4TiO3 （BST） gel was prepared using sol-gel method with acetate as raw material and polyvinylpyrrolidone （PVP） as stabilizer. The thermal evolution process of gel was analyzed, and the BST nanopowder was prepared by both traditional sintering and microwave sintering technology. The pure perovskite phase BST nanopowder with a grain size of about 60 nm can be prepared through microwave sintering at 900 ℃ for 0.5 h. Compared with traditional sintering technology, microwave sintering can shorten the sintering time by 3/4 at the same sintering temperature and can effectively control the coarsening of grains. The BST thick film with em〉 1 000, tan8 〈 0.02 and reduced dispersion coefficient oreoared using this oowder, is a preferred material for fabricating large uncooled focal plane array （UFPA）.