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Effect of Li2O-Na2O-B2O3-SiO2 Sintering Aids on Structure and Dielectric Properties of BaAl2Si2O8 Ceramics
Author NameAffiliationE-mail
YAN Xin-Kan School of Materials Science and Engineering, Xihua University, Chengdu 610039, China  
DING Shi-Hua School of Materials Science and Engineering, Xihua University, Chengdu 610039, China dshihua@263.net 
ZHANG Xiao-Yun School of Materials Science and Engineering, Xihua University, Chengdu 610039, China  
HUANG Long School of Materials Science and Engineering, Xihua University, Chengdu 610039, China  
ZHANG Yun School of Materials Science and Engineering, Xihua University, Chengdu 610039, China  
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
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YAN Xin-Kan,DING Shi-Hua,ZHANG Xiao-Yun,HUANG Long,ZHANG Yun.Effect of Li2O-Na2O-B2O3-SiO2 Sintering Aids on Structure and Dielectric Properties of BaAl2Si2O8 Ceramics[J].Chinese Journal of Inorganic Chemistry,2019,35(8):1357-1362.
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Chinese Journal of Inorganic Chemistry