微波可调BaSrZnSi_2O_7-Ba_(0.5)Sr_(0.5)TiO_3复合陶瓷的结构与介电性能关系

Phase composition,microstructure and dielectric properties of BaSrZnSi_2O_7-Ba_(0.5)Sr_(0.5)TiO_3 microwave tunable composite ceramics

采用传统电子陶瓷工艺制备出BaSrZnSi2O7-Ba0.5Sr0.5TiO3复合陶瓷,系统研究了其相结构、微观结构和介电性能。研究表明:随着BaSrZnSi2O7的加入,样品的居里峰向低温方向移动;但BaSrZnSi2O7加入量达到一定程度后,居里峰在一定的温度下保持稳定。调制特性变化规律类似于居里峰的移动。品质因数(Q值)的变化主要取决于微波材料加入后的"掺杂"和"复合"效果。当BaSrZnSi2O7质量分数为60wt%时,复合材料表现出良好的综合特性:介电可调率为16%(10kHz),介电常数为152,Q值达到417(2.720GHz),表明BaSrZnSi2O7-Ba0.5Sr0.5TiO3复合陶瓷是电可调微波器件很好的潜在应用材料。

BaSrZnSi2O7-Ba0.5Sr0.5TiO3 composite ceramics were systematically characterized in terms of phase composition,microstructure and dielectric properties.It is found that dielectric permittivity peaks of the samples shifted to low temperatures initially and then kept invariable with increasing BaSrZnSi2O7 content.Tunability showed a similar trend to Curie temperature.The variety in Qvalue is mainly related to whether the‘doping’effect or‘composite’effect is dominated.The sample with 60wt%of BaSrZnSi2O7 possess a high tunability of 16%（10kHz）,a low dielectric permittivity of 152and a high Qvalue of 417（2.720GHz）,making it a promising candidate for applications as electrically tunable microwave devices.