无机化学学报
無機化學學報
무궤화학학보
JOURNAL OF INORGANIC CHEMISTRY
2007年
8期
1496-1500
,共5页
程花蕾%崔斌%田靓%俞鹏飞%史启祯
程花蕾%崔斌%田靚%俞鵬飛%史啟禎
정화뢰%최빈%전정%유붕비%사계정
掺锰钛酸钡%介电性能%溶胶-凝胶法
摻錳鈦痠鋇%介電性能%溶膠-凝膠法
참맹태산패%개전성능%용효-응효법
Mn-doped barium titanate%dielectric property%sol-gel process
The Mn-doped barium titanate nanosized powders and ceramics were prepared via the sol-gel process.The powders and ceramics were characterized by XRD, SEM and TEM. The dielectric properties of the ceramics were also measured. The influences of calcination temperature and Mn concentration on the microstructure,dielectric properties and phase composition of BaTiO3 nano-powders and ceramics were discussed. The results indicated that the BaTiO3-based powders doped with 1.0mol% Mn were mainly in cubic BaTiO3 phase, but the tetragonal phase became more evident when the calcination temperature increased. After sintering, Mn-doped ceramics were mainly composed of cubic BaTiO3. Specially, a new phase of hexagonal crystal BaTiO3 and BaMnO3existed in the ceramics doped with 5.0mol% Mn and the ceramic grains were in 'clintheriform'. The structure of 'clintheriform' led to the poor densification of ceramics, reducing the dielectric constant obviously. The dielectric constants of BaTiO3 ceramics first increased and then decreased as the Mn concentration increased. The room temperature dielectric constant was 2 290 and the lowest dielectric loss was 0.004 when the Mn concentration was 0.5mol%.