Citation: 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. doi: 10.11862/CJIC.2019.152 shu

Effect of Li₂O-Na₂O-B₂O₃-SiO₂ Sintering Aids on Structure and Dielectric Properties of BaAl₂Si₂O₈ Ceramics

School of Materials Science and Engineering, Xihua University, Chengdu 610039, China

Corresponding author: DING Shi-Hua, dshihua@263.net
Received Date: 5 March 2019
Revised Date: 8 May 2019

Figures(5)

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 (ε_r) of BAS was discussed. The results showed that LNBS sintering aids could reduce the sintering temperature from 1 400 to 1 325℃, and the O^2- 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 (τ_f) 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, ε_r=6.37 and τ_f=-1.613×10^-5℃^-1.
- LNBS sintering aids,
- BaAl₂Si₂O₈,
- celsian,
- microwave dielectric properties
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Effect of Li₂O-Na₂O-B₂O₃-SiO₂ Sintering Aids on Structure and Dielectric Properties of BaAl₂Si₂O₈ Ceramics