首页|Structure evolution and τf influence mechanism of Bi1-xHoxVO4 microwave dielectric ceramics for LTCC applications
Structure evolution and τf influence mechanism of Bi1-xHoxVO4 microwave dielectric ceramics for LTCC applications
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Bi1-xHoxVO4(0.1 ≤ x ≤ 0.9)ceramics were prepared via a solid-state reaction method,and all the ceram-ics could be well densified in the 920-980 ℃ range.The ceramics with 0.1 ≤ x＜0.4 were composed of both monoclinic scheelite(M)and tetragonal zircon(T)phases,and a single M phase could be obtained in the range of x ≥ 0.4.The measured εr decreased from 58.9(x=0.1)to 14.7(x=0.9),so do the calcu-lated values(εr(C-M)=34.3-12.1),and the main reason for εr＞εr(c-M)was the rattling of Ho3+in the dodecahedron.Two points with zero τf appeared in Bi1-xHoxVO4(0 ≤ x ≤ 1)ceramics,and the best mi-crowave dielectric properties with εr=16.6,Q × f=18,400 GHz(f=10.69 GHz),and τf=+3.29 ppm/℃ were obtained in the Bi0.2Ho0.8VO4 ceramic.The change in temperature coefficient of ionic polarizability(ταm)caused by the rattling effect of cations is the physical essence that affects τf.Therefore,the rattling effect can be used as an effective mechanism to regulate τf in low-εr materials.Furthermore,there was no chemical reaction between Bi1-xHoxVO4 and Ag electrode,which indicates potential applications in low-temperature co-fired ceramic(LTCC)technology.
Key Laboratory of Low-Dimensional Structural Physics and Application,Education Department of Guangxi Zhuang Autonomous Region,College of Physics and Electronic Information Engineering,Guilin University of Technology,Guilin,541004,China
Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices,Guangxi Key Laboratory of Optical and Electronic Materials and Devices,College of Materials Science and Engineering,Guilin University of Technology,Guilin,541004,China
School of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin,541004,China
Natural Science Foundation of Guangxi Zhuang Autonomous RegionGuangxi Key Laboratory of Optical and Electronic Materials and DevicesNatural Science Foundation of ChinaNatural Science Foundation of ChinaGuilin University of Technology Research Startup ProjectGuangxi BaGui Scholars Special Funding
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