摘要
以分析纯的Bi(NO3)3·5H2O和Y(NO3)3·6H2O作为原料,经反向滴定法化学共沉淀、干燥和430℃焙烧后获得(75mol%Bi2O3+25mol%Y2O3)纳米复合粉体,粉体平均粒度30nm以下;通过常压反应烧结工艺制备了纳米Bi2O3 Y2O3快离子导体,对烧结过程中高导电相(纳米δ Bi2O3)的形成规律研究结果表明:烧结初期以固溶反应为主,后期以晶粒长大为主,晶粒生长规律符合(D-D0)2=K·t抛物线方程;用模式识别技术对δ Bi2O3相生成的工艺条件进行了优化。
With A.R.Bi(NO3)3·5H2O and Y(NO3)3·6H2O being raw material, nanometer (75 mol% Bi2O3 + 25 mol% Y2O3) powder was prepared by reversing titration with chemical coprecipitation; its average grain size was below 30 nm. The above powder was pressed to billets, and then sintered at different temperatures by pressureless sintering; By XRD technique, the law of grain grow-up and that of δ-Bi2O3 formation were studied, and the results showed that the initial stage of sintering was primarily solution reaction, and the anaphase was mostly crystal grain growth which followed the rule of paracurve: (D-D0)2 = K·t. In the end, the above sintering condition was optimized by pattern recognition technique.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2004年第6期727-729,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20101006)
关键词
纳米氧化铋
共沉淀法
δ-Bi2O3
工艺优化
Grain size and shape
Ionic conduction
Nanostructured materials
Precipitation (chemical)
Sintering
Titration
X ray diffraction analysis
Yttrium compounds
