摘要
采用柠檬酸盐法制备出Ba_(0.6)Sr_(0.4)TiO_3+x wt.%Li_2O(x=0,0.5)超细粉体,通过传统烧结方法制备陶瓷样品,研究了陶瓷样品的烧结性能和介电性能。结果表明,0.5wt.%Li_2O显著地降低了Ba_(0.6)Sr_(0.4)TiO_3的致密化温度(900℃),并且陶瓷样品具有优异的介电性能。该材料的低温烧结机理可归属为过渡液相烧结,烧结助剂Li_2O和Ba_(0.6)Sr_(0.4)TiO_3表面碳化被认为是液相的起源。"融入-析出"机理可解释陶瓷样品低温致密化和晶粒生长过程。
The superfine powders with nominal composition of Ba0.6Sr0.4TiO3+x wt.%Li2O(x=0 and x=0.5)were prepared by the citrate method.Sintering and dielectric properties were investigated for the ceramic specimens.0.5wt.%Li2O was shown to be highly contributive to reduce the sintering temperature of Ba0.6Sr0.4TiO3 ceramics.In addition,the obtained ceramics displayed preferable dielectric properties.The low-temperature sintering mechanism may be attributed to transient liquid phase sintering.Sintering aid Li2O and surface carbonation of Ba0.6Sr0.4TiO3 are considered to be the origin of the eutectic liquid phase.Low temperature densification and grain growth process can be explained in terms of dissolution-precipitation mechanism.
作者
张校飞
左小华
牛永斌
熊辉
ZHANG Xiaofei;ZUO Xiaohua;NIU Yongbin;XIONG Hui(School of Mathematics and Physics,Hubei Ploytechnic University,Huangshi 435003,Hubei,China;School of Chemistry and Chemical Engineering,Hubei Ploytechnic University,Huangshi 435003,Hubei,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China)
出处
《陶瓷学报》
CAS
北大核心
2018年第6期716-721,共6页
Journal of Ceramics
基金
国家自然科学基金面上项目(51372077)
湖北省知识创新专项(2016CFC742)
湖北理工学院引进人才项目(12xjz02R
14xjz03R)
关键词
电介质材料
钛酸锶钡
低温烧结
过渡液相
介电性能
dielectric materials
barium strontium titanate
low temperature sintering
transient liquid phase
dielectric properties
