Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of the $V_2$$O_5$ Additive on ${ZnNb_2}{O_6}$ Microwave Dielectrics

  • Yoo, Sang-Im (School of Materials Science and Engineering, Seoul National University) ;
  • Kim, Dong-Wan (School of Materials Science and Engineering, Seoul National University) ;
  • Wee, Sung-Hun (School of Materials Science and Engineering, Seoul National University) ;
  • Hong, Kug-Sun (School of Materials Science and Engineering, Seoul National University)
  • Published : 2001.04.01
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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>.

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