摘要
以乙酸钡、乙酸钪和钛酸丁酯为前躯体,采用溶胶-凝胶法合成了BaTi0.95Sc0.05O3-δ纳米粉体,研究了其物相组成、烧结特性及介电性能。结果表明,干凝胶在800℃预烧可获得粒径约40nm的单相赝立方BaTi0.95Sc0.05O3-δ纳米粉体;BaTi0.95Sc0.05O3-δ纳米粉体具有较好的烧结活性,低温下烧结可获得致密陶瓷。当烧结温度为1 0001 200℃时,陶瓷相为纯赝立方相;温度升高到1 300℃,赝立方与六方相共存。Sc掺杂促使钛酸钡的晶粒尺寸减小至900nm,导致介电峰展宽,居里温度向低温方向移动,由120℃降至70℃。
BaTi0.95 Sc0.05O3-δ nanopowders were prepared by the Sol-Gel method for the first time, using Ba（CH5COO）2 ,Sc（CH3COO）3 and Ti（C4H9O）4 as precursors. The phase, sintering characteristic and dielectric properties of BaTi0.95 Sc0.05O3-δ were investigated. It shows that single phase pseudo-cubic BaTi0.95 Sc0.05O3-δ nanop- owders with a grain size of -40 nm were obtained when xerogels were pre-heated at 800 ℃. Due to the high sinte- ring activity of BaTi0.95 Sc0.05O3-δ nanopowders, ceramics with good densification can be achieved at a low sintering temperature. When the sintering temperature was 1 000-1 200 ℃, the ceramic phase was pure pseudo-cubic, while the temperature was increased to 1 300 ℃, the pseudo-cubic was co-existed with the hexagonal phase. Doping with Sc can dramatically refine the grain size of BaTiO5 to -900 nm. Correspondingly, the dielectric peak was widened and the Curie temperature decreased from 120 ℃ to 70 ℃.
出处
《压电与声光》
CSCD
北大核心
2013年第3期412-415,共4页
Piezoelectrics & Acoustooptics
基金
浙江省创新团队计划基金资助项目(2011R09010)
