拓扑化学反应制备片状Na_(0.5)Bi_(0.5)TiO_3粉体的研究  

INVESTIGATION OF LAMELLAR Na_(0.5)Bi_(0.5)TiO_3 POWDER PREPARED BY A TOPOCHEMICAL REACTION

作　　者：赵戈[1] 江向平[1] 舒凯征[1] 涂娜[1] 李月明[1] 

机构地区：[1]景德镇陶瓷学院,景德镇333001

出　　处：《陶瓷学报》2009年第1期54-58,共5页Journal of Ceramics

基　　金：国家自然科学基金(编号:50862005;50562002);江西省自然科学基金(编号:2008GZC0009;2007GZC1258)

摘　　要：通过熔盐法制备出具有铋层结构的前驱体Na0.5Bi4.5Ti4O15，其取向度f值（Lotgering factor法）高达0．9。粉体Na0.5Bi4.5Ti4O15再与Na2CO3和TiO2发生拓扑化学反应，铋层状结构Na0.5Bi4.5Ti4O15完全转变成钙钛矿结构的Na0.5Bi0.5TiO3（NBT），所得到NBT粉体保留了NBIT的层状形貌，其厚度约0．4μm，长度为5～10μm，显示出较高的各向异性。研究了烧成温度对前躯体NBIT微粒形态的影响。通过SEM分析，固相法，熔盐法和拓扑反应合成的NBT粉体微观结构显示出巨大的差异。As the precursors of Na0.5Bi0.5TiO3 （NBT）, bismuth-layer-structured Na0.5Bi4.5Ti4O15 （NBIT）particles were first synthesized by molten salt process. The degree of orientation （calculated by Lotgering factor method ） f is 0.9. After the topochemical reaction with the complementary reactants （Na2CO3 and TiO2） in NKCI flux, layer-structured NBIT particles were transformed to the perovskite NBT particles retaining the morphology feature of the precursor. NBT particles with a thickness of about 0.4μm and a length of 5-10μm. It showed highly anisotropic structure. The effects of NBIT particles reacting temperature on the morphology were investigated. The microstructure of NBT particles synthesized by solid-state reaction,molten salt method and topochemical reaction showed notable difference.

关 键 词：无铅压电陶瓷 NBT 拓扑化学反应 熔盐法 各向异性 

分 类 号：TQ174.75[化学工程—陶瓷工业]