Ba2-xSm4+2x/3Ti9O26 (x= 0-0.3) was selected as the formula for BaO-Sm2O3-4.5TiO2 ceramics based on the structure formula of the tungsten-bronze-type structure. The microstructure and microwave dielectric properties of Ba2-xSm4+2x/3Ti9O26 and the relationships between them were investigated in this study. The microstructure of Ba2-xSm4+2x/3Ti9O26 ceramics consists of a uniform matrix of primary BaO-Sm2O3-4TiO2 and BaO-Sm2O3-5TiO2 with small amounts of dispersed second phase, TiO2 and Ba2Ti9O20. Excellent dielectric properties of εr = 68-79, Q × f = 11 000-12 500 GHz and good temperature stability at the resonant frequency (τf = 0 ppm per °C) were obtained. The relationships between the microstructure, second phases and microwave dielectric properties were concerned. XRD patterns, energy dispersive X-ray spectrometer (EDS) analysis and scanning electron microscopy are also presented.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering