B_2O_3-Li_2O掺杂低温烧结Ba_(0.6)Sr_(0.4)TiO_3陶瓷的介电性能

DIELECTRIC PROPERTIES OF B_2O_3-Li_2O CO-DOPED Ba_(0.6)Sr_(0.4)TiO_3 CERAMICS SINTERED AT A LOW TEMPERATURE

采用传统陶瓷制备工艺,通过B2O3-Li2O的有效掺杂,低温液相烧结制备了Ba0.6Sr0.4TiO3(BST)陶瓷,并对其介电性能进行了研究。X射线衍射分析和介电性能测试结果表明:适量B2O3-Li2O掺杂的BST陶瓷,经975℃烧结4h,所得样品的主晶相为钙钛矿结构,未出现明显的杂相;随B2O3-Li2O掺杂量的增加,BST陶瓷材料的介电常数减小,Curie峰变得弥散宽化,介电损耗则与未掺杂BST陶瓷的保持一致,即在0.003以下;适量B2O3-Li2O的掺杂对BST陶瓷材料的Curie温度和介电调制性能影响不大。

Bao 6Sr0.4TiO3 ceramics were fabricated via the traditional ceramic process at a low sintering temperature and using B2O3-Li2O as a liquid-phase sintering aid. The dielectric properties of Ba0.6Sr0.4TiO3 ceramics were investigated. The main crystal phase of samples with appropriate B2O3-Li2O additive sintered at 975 ℃ for 4 h had a perovskite type structure and not the obviously secondary phase according to X-ray diffraction analysis. The dielectric constant decreases and the Curie peaks are suppressed and broadened for the ceramic with the increase of B2O3-Li2O content, and the dielectric loss at room temperature remains around 0.003 at the measurement frequency of 10 kHz. B2O3-Li2O additives have a slight influence on the Curie temperature and the tunability.