摘要
采用溶胶-凝胶法制备BaTiO_3纳米粉料,研究了热处理温度对纳米粉料尺寸的影响,在800℃热处理可获得粒径约60 nm粉料。BaTiO_3纳米粉料具有颗粒表面积大,反应活性高等特点,以此作为添加剂研究纳米粉料对BaTiO_3陶瓷微观结构和介电常数的影响。BaTiO_3纳米粉料能促使陶瓷致密同时,极大地提高了BaTiO_3系统陶瓷的介电常数。用固相烧结理论中的颈长速度方程、线收缩率方程对其内在机理进行了分析。实验表明,添加6%(质量分数,下同)纳米BaTiO_3的陶瓷体系,具有最大的介电常数。其主要工艺条件和性能参数为:烧结温度1240℃保温6h,在1 kHz下ε≈5500。
Nanometer BaTiO3 powder was prepared by sol-gel process. The influence of calcining temperature on the average particle size of BaTiO3 powder and the effect of nanometer BaTiO3 powder addition on the microstructure and dielectric constant of BaTiO3 were discussed. The average particle size of nanometer BaTiO3 powder calcined at 800 ℃ was about 60 nm. The nanometer BaTiO3 powder improved densification of the Ceramics and enhanced dielectric constant. The role of the nanometer BaTiO3 powder was explained using solid state sintering theory. The ceramics doped with 6wt% nanometer BaTiO3 powder and sintered at 1240 ℃ for 6 h exhibited the dielectric constant of 5500 at 1 kHz.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期531-534,共4页
Rare Metal Materials and Engineering
基金
天津市自然科学基金资助项目(06YFJMJC01000)
