Effects of BaCu(B 2 O 5 ) addition on sintering temperature and microwave dielectric properties of Ba 5 Nb 4 O 15 –BaWO 4 ceramics
2014; IOP Publishing; Volume: 23; Issue: 4 Linguagem: Inglês
10.1088/1674-1056/23/4/047801
ISSN2058-3834
AutoresRui-Long Jia, Hua Su, Xiaoli Tang, Yulan Jing,
Tópico(s)Multiferroics and related materials
ResumoThe effects of BaCu(B2O5) (BCB) addition on the microstructure, phase formation, and microwave dielectric properties of Ba5Nb4O15−BaWO4 ceramic are investigated. As a sintering aid, BaCu(B2O5) ceramic could effectively lower the sintering temperature of Ba5Nb4O15−BaWO4 ceramic from 1100 °C to 950 °C due to the liquid-phase effect. Meanwhile, BaCu(B2O5) addition effectively improves the densification of Ba5Nb4O15−BaWO4 ceramic and significantly influences the microwave dielectric properties. X-ray diffraction analysis reveals that Ba5Nb4O15 and BaWO4 coexist with no crystal phase of BaCu(B2O5) in the sintered ceramics. The Ba5Nb4O15−BaWO4 ceramics with 1.0 wt% BaCu(B2O5) sintered at 950 °C for 2 h presents good microwave dielectric properties of εr = 19.0, high Q×f of 33802 GHz and low τf of 2.5 ppm/°C.
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