Microstructure and dielectric properties control of Ba4(Nd0.7Sm0.3)9.33Ti18O54 microwave ceramics

Microwave ceramics of Ba4(Nd0.7Sm0.3)9.33Ti18O54 with 0-3 wt% Ag additions were synthesised by a citrate sol-gel method. BaO-B2O3-SiO2 glass was also added to the sol-gel derived BNST ceramic powders as sintering aids. The undoped, Ag- and BaBS-doped samples were sintered at 1250, 1150 and 1000 C, r...

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Published in:Ceramics international 2009-01, Vol.35 (1), p.253-257
Main Authors: Pei, Jing, Yue, Zhenxing, Zhao, Fei, Gui, Zhilun, Li, Longtu
Format: Article
Language:English
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Summary:Microwave ceramics of Ba4(Nd0.7Sm0.3)9.33Ti18O54 with 0-3 wt% Ag additions were synthesised by a citrate sol-gel method. BaO-B2O3-SiO2 glass was also added to the sol-gel derived BNST ceramic powders as sintering aids. The undoped, Ag- and BaBS-doped samples were sintered at 1250, 1150 and 1000 C, respectively. The microstructure and dielectric properties were controlled by doping with Ag or BaBS glass. Near isoaxial grains with about 250 nm and typical columnar grains were obtained for the silver-doped and BaBS-doped samples, respectively. For the < 1 wt% silver-doped samples, the dielectric constant and Qxf remained unaltered but tauf decreased from 9 ppm/C to 1.4 ppm/C. With increasing silver content from 1 wt% to 3 wt%, the dielectric constant and tauf significantly increased but Qxf decreased. For the BaBS-doped samples, both dielectric constant and Qxf decreased but tauf increased with increasing BaBS content.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2007.10.018