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J. Korean Ceram. Soc. > Volume 38(4); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(4): 308.
Effects of the $V_2$$O_5$ Additive on ${ZnNb_2}{O_6}$ Microwave Dielectrics
Sang-Im Yoo, Dong-Wan Kim, Sung-Hun Wee, Kug-Sun Hong
School of Materials Science and Engineering, Seoul National University
ABSTRACT
We report the effects of the V$_2$O$_{5}$ additive on the sintering behavior and microwave dielectric properties of ZnNb$_2$O$_{6}$ ceramics. Densification temperatures of V$_2$O$_{5}$-doped ZnNb$_2$O$_{6}$ samples are lowered to the range of 875-9$25^{circ}C$ because of the liquid phase sintering. Doped samples are composed of a Zn(Nb,V)$_2$O$_{6}$ solid solution and second phases. Up to 5 wt% V$_2$O$_{5}$ is the only second phase, however, V$_2$O$_{5}$ also exists as the second phase for 10 wt% V$_2$O$_{5}$ addition. In comparison with reported values of undoped ZnNb$_2$O$_{6}$ ceramics, microwave properties of V$_2$O$_{5}$-doped ZnNb$_2$O$_{6}$ samples are seriously degraded, which is confirmed to originate from the second phases. The optimum microwave properties (Q$times$f=13,800, $varepsilon$$_{r}$=23, $tau$$_{f}$=-66ppm/$^{circ}C$) are obtained from ZnNb$_2$O$_{6}$ with the addition of 5 wt% V$_2$O$_{5}$ sintered at 90$0^{circ}C$.90$0^{circ}C$.EX>.
Key words: ${ZnNb_2}{O_6}$, $V_2$$O_5$, Microwave dielectric properties, Sintering, Densification
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