Li_2O掺杂Ba_(0.6)Sr_(0.4)TiO_3陶瓷的低温烧结与介电性能  

Low Temperature Sintering and Dielectric Properties of Ba_(0.6)Sr_(0.4)TiO_3 with Li_2O Addition

作　　者：张校飞[1] 

机构地区：[1]湖北理工学院数理学院,湖北黄石435003

出　　处：《湖北理工学院学报》2017年第3期34-37,共4页Journal of Hubei Polytechnic University

基　　金：湖北省教育厅科学技术研究项目(项目编号:B2016277)

摘　　要：Ba_(1-x)Sr_xTiO_3材料具有强的介电非线性特性,在可调微波器件方面有广阔的应用前景。电子陶瓷器件的小型化、集成化的发展要求Ba_(1-x)Sr_xTiO_3材料能够实现低温烧结。采用柠檬酸盐法制备名义组成为Ba_(0.6)Sr_(0.4)TiO_3+0.5wt.%Li_2O(简称BSTL)的陶瓷样品,研究了在烧结温度为900℃下,保温时间对BSTL陶瓷的结构与介电性能的影响。研究结果表明,Li_2O的添加有效地降低了Ba_(0.6)Sr_(0.4)TiO_3(简称BST)材料的烧结致密化温度。保温时间的增加,促进了Li+固溶进入BST晶格,加快烧结过程中的传质,提高了样品的致密度。烧结温度为900℃、保温时间为8 h的陶瓷样品介电性能最佳:在频率10 k Hz下,介电常数为2 246,介电损耗为0.3%;偏置电场为30 k V/cm和频率为10 k Hz条件下,可调性为29.6%,优值系数(FOM)为96.2。Barium strontium titanate exhibits strong dielectric nonlinearity, being a promising candidate materi-als for electrically tunable microwave devices. Miniaturization and intergration have been the trend of electron-ic devices,making it indispensable for the low - tempeature sintering of Ba1-xSrxTiO3 materials. In this pa- per,ceramic specimens with a nominal composition of Ba0. 6Sr0.4TiO3 ＋ 0. 5 wt. % Li2O （ abbreviated as BSTL） were prepared from the citrate method. The effect of dwell time on the structure and dielectric proper-ties of BSTL ceramics sintered at 900 ℃ were investigated. The Li2O addition was found to reduce effectively the sintering temperature of Ba0.6Sr0.4TiO3 （ abbreviated as BST） ceramics. The dwell time was observed to contribute to the diffusion of Li＋ into BST lattice, accelerating the mass transfer and increasing the densities of the ceramic specimens. The ceramic specimen sintered at 900 Xl and with dwell time of 8 h attained optimum dielectric properties. The ceramic specimen showed a dielectric constant of 2 246,a dielectric loss of 0. 3% at 10 kHz,together with a tunability of 29. 6% , figure of merit（FOM）of 96. 2 at 10 kHz and 30 kV/cm.

关 键 词：电介质材料 柠檬酸盐法 低温烧结 显微结构 介电性能 

分 类 号：TQ12[化学工程—无机化工]