Li2O-B2O3-SiO2玻璃相对BaAl2Si2O8结构及微波介电性能的影响  

Structure and Microwave Dielectric Property of BaAl2Si2O8 with Li2O-B2O3-SiO2 Glass Addition

作　　者：黄龙 丁士华[1] 张晓云 严欣堪 李超 朱惠 HUANG Long;DING Shi-Hua;ZHANG Xiao-Yun;YAN Xin-Kan;LI Chao;ZHU Hui(School of Materials Science and Engineering, Xihua University, Chengdu 610039, China)

机构地区：[1]西华大学材料科学与工程学院

出　　处：《无机材料学报》2019年第10期1091-1096,共6页Journal of Inorganic Materials

基　　金：教育部春晖计划项目(Z2011077);四川省特种材料及制备技术重点实验室开放课题资助项目(szjj2017-059);四川省教育厅资助项目(14ZB0126);四川省粉末冶金工程技术中心资助项目(SC-FMYJ2017-04,SC-FMYJ2017-07);国家自然科学基金(11074203);西华大学研究生创新基金(ycjj2018012,ycjj2018013)~~

摘　　要：采用固相工艺制备BaAl2Si2O8-xwt%Li2O-B2O3-SiO2(x=0,0.1,0.3,0.5,1.0,2.0)陶瓷。探究不同含量的Li2O-B2O3-SiO2(LBS)玻璃相对BaAl2Si2O8(BAS)陶瓷的烧结温度、结构及微波介电性能的影响。结果表明:LBS玻璃相可明显降低BAS陶瓷的烧结温度,并促进BAS陶瓷晶粒长大和晶体结构由六方相转变为单斜相。当x=0.1时,六方相即可全部转变为单斜相,在0.1≤x≤2.0范围内, BAS陶瓷晶体结构均为单斜相。添加0.3wt%的LBS玻璃相可促进BAS样品密度、介电常数和品质因数增大,谐振频率温度系数绝对值减小。在x=0.3,烧结温度为1275℃时,可获得具有较好品质因数的单斜钡长石,其介电性能:εr=6.74, Q×f=34570 GHz,τf=–15.97×10^–6/℃。The BaAl2Si2O8-xwt%Li2 O-B2 O3-SiO2(x=0, 0.1, 0.3, 0.5, 1.0, 2.0) ceramics with small amount of Li2 O-B2 O3-SiO2(LBS) glass addition were prepared by solid state sintering. The sintering temperature, structure and microwave dielectric properties of BaAl2 Si2 O8(BAS) ceramics with xwt%LBS glass addition were investigated. The results show that the LBS glass can greatly reduce the sintering temperature, promote the growth of grain and the transformation of hexacelsian-to-celsian of BAS ceramics. As x=0.1, all the hexacelsian were transformed into celsian, and the second phase was not observed as x≤2.0. The 0.3 wt%LBS glass can promote the density, dielectric constant and Q × f value increase, and the absolute value of τf decrease. Especially, the BAS ceramics with the 0.3 wt%LBS glass addition sintered at 1275 ℃ shows a good Q × f of 34570 GHz, and the dielectric properties are εr = 6.74 and τf =–15.97 × 10^–6/℃.

关 键 词：钡长石 单斜相 晶体结构 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]