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	Effects of W,Ti co-doping on the microstructure and microwave dielectric properties of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics
	Hao Zhuang ; Zhenxing Yue ; Fei Zhao ; Jing Pei ; Gang Yang ; Longtu Li
	2010-10-12 ; 2010-10-12
关键词	Experimental/ barium compounds ceramics dielectric materials doping electrochemical impedance spectroscopy grain growth grain size microwave materials permittivity scanning electron microscopy sintering solubility titanium tungsten X-ray diffraction/ microwave dielectric ceramics solid-state reaction method sintering temperature X-ray powder diffraction solubility scanning electron microscopy grain growth grain size co-doping dielectric constant temperature coefficient SEM XRD AC impedance spectrum analysis temperature 1450 degC to 1250 degC Ba/sub 5/Nb/sub 4/O/sub 15/:W,Ti/ A8120L Preparation of ceramics and refractories A6475 Solubility, segregation, and mixing A6480G Microstructure A6170T Doping and implantation of impurities A7720 Dielectric permittivity A8280F Electrochemical analytical methods A8120E Powder techniques, compaction and sintering/ temperature 1.72315E+03 to 1.52315E+03 K/ Ba5Nb4O15:W,Ti/ss Ba5Nb4O15/ss O15/ss Ba5/ss Nb4/ss Ba/ss Nb/ss Ti/ss O/ss W/ss Ti/el W/el Ti/dop W/dop
中文摘要	W,Ti co-doped Ba/sub 5/Nb/sub 4/O/sub 15/ microwave dielectric ceramics with compositions of Ba/sub 5/Nb/sub 4-x/(W/sub 1/2/Ti/sub 1/2/)/sub x/O/sub 15/ (x = 0-2) were prepared by solid-state reaction method. W/sup 6+/ and Ti/sup 4+/ substitution for Nb/sup 5+/ can markedly lower the sintering temperature of Ba/sub 5/Nb/sub 4/O/sub 15/ from 1450 to 1250 degrees C. X-ray powder diffraction (XRD) analysis reveals that BaWO/sub 4/ formed as a secondary phase due to the limited solubility of WO/sub 3/ in perovskite Ba/sub 5/Nb/sub 4/O/sub 15/ when x > 0.4. Scanning electron microscopy (SEM) observation suggests that a small amount of W and Ti co-doping can suppress the grain growth of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics, indicating that the grain size decreases from ~25 to ~3 mu m. The microwave dielectric properties of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics is largely improved by W,Ti co-doping. With increasing x, the Q * f value increases from 25,200 GHz for undoped samples (x = 0) to 38,600 GHz for x = 0.4, and then declines to 19,500 GHz for x = 1.2. In the composition range x = 0-1.2, the dielectric constant increases slightly from 39.2 to 44, while the temperature coefficient decreases from ~78 to ~50 ppm/ C. The reasons for the improvement of the dielectric properties were investigated by SEM, XRD. and AC impedance spectrum analysis.
语种	英语
出版者	Japan Soceity of Applied Physics ; Japan
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78406]
专题	清华大学
推荐引用方式 GB/T 7714	Hao Zhuang,Zhenxing Yue,Fei Zhao,et al. Effects of W,Ti co-doping on the microstructure and microwave dielectric properties of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics[J],2010, 2010.
APA	Hao Zhuang,Zhenxing Yue,Fei Zhao,Jing Pei,Gang Yang,&Longtu Li.(2010).Effects of W,Ti co-doping on the microstructure and microwave dielectric properties of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics..
MLA	Hao Zhuang,et al."Effects of W,Ti co-doping on the microstructure and microwave dielectric properties of Ba/sub 5/Nb/sub 4/O/sub 15/ ceramics".(2010).

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