Li2O-Na2O-B2O3-SiO2烧结助剂对BaAl2Si2O8陶瓷结构与介电性能的影响
Effect of Li2O-Na2O-B2O3-SiO2 Sintering Aids on Structure and Dielectric Properties of BaAl2Si2O8 Ceramics
作者单位E-mail
严欣堪 西华大学材料科学与工程学院, 成都 610039  
丁士华 西华大学材料科学与工程学院, 成都 610039 dshihua@263.net 
张晓云 西华大学材料科学与工程学院, 成都 610039  
黄龙 西华大学材料科学与工程学院, 成都 610039  
张云 西华大学材料科学与工程学院, 成都 610039  
摘要: 采用传统固相反应工艺,按化学计量比合成BaO-Al2O3-SiO2(BAS)-x%(w/w)Li2O-Na2O-B2O3-SiO2(LNBS)(x=0,1,2,3,4)陶瓷。研究不同LNBS烧结助剂添加量对BAS系微波介质陶瓷的结构和介电性能的影响。通过Clausius-Mossotti公式计算讨论了BAS理论与实验介电常数(εr)的差异。研究结果表明:LNBS烧结助剂中Li+进入钡长石Al3+位或单四元环(S4R)间隙,并产生了O2-空位或Ba2+空位,从而促进BAS六方相向单斜相的转变。添加适量的LNBS烧结助剂后,BAS陶瓷的烧结温度从1 400℃降低到1 325℃,同时BAS陶瓷样品密度、品质因数(Qf)值以及频率温度系数(τf)得到改善。当x=1,烧结温度为1 325℃时,可获得综合性能相对较好的BAS陶瓷,其介电性能:Qf=35 199 GHz,εr=6.37,τf=-1.613×10-5-1
关键词: LNBS烧结助剂  BaAl2Si2O8  单斜相  微波介电性能
基金项目: 教育部春晖计划项目(No.Z2011077)和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(No.szjj2017-059)。
Abstract: BaO-Al2O3-SiO2 (BAS)-x%(w/w) Li2O-Na2O-B2O3-SiO2 (LNBS) (x=0, 1, 2, 3, 4) ceramics were prepared by solid state route. The effect of LNBS sintering aids on the microstructure and dielectric properties of BAS system ceramics were studied. Deviation between theoretical and experimental permittivity (εr) of BAS was discussed. The results showed that LNBS sintering aids could reduce the sintering temperature from 1 400 to 1 325℃, and the O2- vacancy or Ba2+ were formed by Li+ substituting for Al3+ or Li+ entering into the single four-membered-ring (S4R) to promote the transformation of hexacelsian to celsian of BAS. The density, quality factor (Qf) value, the temperature coefficient of resonant frequency (τf) of BAS-x% LNBS ceramics have been improved by adding moderate LNBS sintering aids. The BAS-1% LNBS sintered at 1 325℃ obtained well dielectric properties:Qf=35 199 GHz, εr=6.37 and τf=-1.613×10-5-1.
Keywords: LNBS sintering aids  BaAl2Si2O8  celsian  microwave dielectric properties
投稿时间:2019-03-05 修订日期:2019-05-08
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严欣堪,丁士华,张晓云,黄龙,张云.Li2O-Na2O-B2O3-SiO2烧结助剂对BaAl2Si2O8陶瓷结构与介电性能的影响[J].无机化学学报,2019,35(8):1357-1362.
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