摘要：以工业生产的BaTiO₃粉体为基础原料,探讨不同预处理条件及Sr、Y元素掺量对BaTiO₃陶瓷显微结构及介电性能的影响。结果表明:掺杂少量的Sr、Y元素可促进BaTiO₃晶体向四方相转变;用乙醇作球磨介质处理粉体并在900℃预烧,可促进陶瓷的致密烧结和晶粒细化;掺杂摩尔分数为1.0%的Sr,可使居里温度降低2℃,室温相对介电常数提高到2 400以上;掺杂Y元素可使陶瓷的居里温度升高,并显著提高陶瓷的介电常数,Y元素掺量为0.3%(摩尔分数)时,室温相对介电常数达到21 000以上。

关键词： 陶瓷粉体；预处理；介电性能

Abstract：The influence of different pretreatments and doping amounts of strontium or yttrium on the microstructure and dielectric properties ofBaTiO₃ ceramics was studied， using industrial produced BaTiO₃ as the raw materials. The results showed that the small doping amount of strontium or yttrium promoted the tetragonal changing of BaTiO₃ crystals. Using ethanol as the ball-milling media and preheating at 900 ℃ could promote the sintering of ceramic and refinement of crystalline. When the doping amount of strontium was 1.0%（molar fraction）， the Curie temperature of ceramics dropped by 2 ℃， and the relative dielectric constant increased to 2 400. Doping of yttrium raised the Curie temperature and significantly increased the dielectric constant of ceramics. When the doping amount of yttrium was 0.3%（molar fraction）， the relative dielectric constant of the ceramics reached over 21 000 at room temperature. 

Keywords：ceramic powder； pretreatment； dielectric property