摘要
用改进的溶胶凝胶工艺制备Ba0.6Sr0.4TiO3(BST)陶瓷及厚膜,研究它们的结晶情况与电学性能。在这种改进的工艺中,将经高能球磨制备的纳米BST陶瓷粉体加入到同组分的BST的溶胶液中,制备成稳定的悬浮性好的浆料,并用此浆料制备BST陶瓷及厚膜。实验结果表明:采用两步烧结法可制备细晶、较致密的BST陶瓷材料,它呈现明显的弥散相变特征,具有较好的介电性能,晶粒尺寸<1μm。用匀胶法制备的沉积在Pd/Ag电极上的BST厚膜,膜厚约为10μm,也呈现明显的弥散相变特征。在1 200℃烧结后的厚膜在0℃,1 kHz时,相对介电常数为900,介电损耗为0.03。
Barium strontium titanate （Ba0.6 Sr0.4 TiO3 , BST） ceramics and thick films were fabricated using a modified sol - gel method. Their crystallization process and electrical properties were investigated. In the process, the ealeinated BST powders were ball milled into nano-sized particles using a high-energy planetary ball mill, and the nano-sized ceramic particles were uniformly dispersed into BST sol solution with the same chemical composition as the powder. The slurry prepared by the above procedure shows good stability and suspensibility. The BST ceramics and thick films were fabricated by the slurry. The results show that the higher relative density and fine grained BST ceramics （grain size -μm ） prepared by two-step sintering method have the characteristic of diffused phase transition with good dielectric properties. Thick films with a thickness of 10 μm on Pd/Ag electrode alumina substrates also show the characteristic of diffused phase transition by the spin coating technique. The relative dielectric constant and loss tangent of the thick films sintered at 1 200 ℃ are about 900 and 0.03 at 0 ℃ , 1 kHz.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第11期1362-1365,共4页
Journal of The Chinese Ceramic Society
基金
国家"973"计划(2002CB613304)资助项目
关键词
钛酸锶钡陶瓷
改进的溶胶-凝胶法
2步烧结法
厚膜
弥散相变
barium strontium titanate ceramics
modified sol - gel process
two-step sintering method
thick film
diffused phase transition
