Microwave dielectric properties of Ba2−xSm4+2/3xTi9O26 ceramics with zero temperature coefficient
Microwave dielectric properties of Ba2−xSm4+2/3xTi9O26 ceramics with zero temperature coefficient
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DOI：
10.1016/s0921-5093(01)01811-1
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发表时间：
2002-09
期刊：
影响因子：
6.4
通讯作者：
Yao-Chung Chen;Chengxiong Huang
中科院分区：
文献类型：
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作者：
Yao-Chung Chen;Chengxiong Huang
根据钨青铜型结构的结构式，选择Ba 2 − xSm 4 +2x/3 Ti 9 O26（x=0-0.3）作为BaO-Sm 2 O3 - 4.5TiO2陶瓷的结构式。研究了Ba 2 − xSm 4 +2x/3 Ti 9 O26的微观结构和微波介电性能及其相互关系。Ba 2 − xSm 4 +2x/3 Ti 9 O26陶瓷的显微结构由均匀的初生BaO-Sm 2 O3 - 4 TiO 2和BaO-Sm 2 O3 - 5 TiO 2基体以及少量分散的第二相TiO 2和Ba 2 Ti 9 O20组成。获得了优异的介电性能（εr=68-79，Q×f=11 000-12 500 GHz）和谐振频率（τf=0 ppm/°C）下良好的温度稳定性。 研究了陶瓷的微观结构、第二相与微波介电性能的关系。还提供了XRD图谱、能量色散X射线光谱仪（EDS）分析和扫描电子显微镜。
Ba2−xSm4+2x/3Ti9O26(x=0–0.3) was selected as the formula for BaO–Sm2O3–4.5TiO2ceramics based on the structure formula of the tungsten–bronze-type structure. The microstructure and microwave dielectric properties of Ba2−xSm4+2x/3Ti9O26and the relationships between them were investigated in this study. The microstructure of Ba2−xSm4+2x/3Ti9O26ceramics consists of a uniform matrix of primary BaO–Sm2O3–4TiO2and BaO–Sm2O3–5TiO2with small amounts of dispersed second phase, TiO2and 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.