TY - JOUR
T1 - Microwave dielectric properties of
AU - Chen, Yao Chung
AU - Huang, Cheng Liang
N1 - Funding Information:
This work was sponsored by the National Science Council of the Republic of China under grant NSC89-2216-E-006-066.
PY - 2002/9/1
Y1 - 2002/9/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0921-5093(01)01811-1
DO - 10.1016/S0921-5093(01)01811-1
M3 - Article
AN - SCOPUS:0036720378
SN - 0921-5093
VL - 334
SP - 250
EP - 256
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -