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Sinterability and Microwave Dielectric Properties of xZnWO4-(1-x)TiO2 Ceramics Sintered at Low Temperature

저온 소결용 xZnWO4-(1-x)TiO2 세라믹스의 소결 및 마이크로파 유전 특성

  • 윤상옥 (강릉대학교 세라믹공학과) ;
  • 김관수 (강릉대학교 세라믹공학과) ;
  • 심상흥 (강원대학교 삼척캠퍼스 전기공학과) ;
  • 박종국 (강원대학교 삼척캠퍼스 전기공학과)
  • Published : 2006.09.01

Abstract

Sinterability and microwave dielectric properties of $xZWO_{4}-(1-x)TiO_{2}$ ceramic systems with zinc-borosilicate glass and $TiO_{2}$ contents for LTCC(Low Temperature Co-fired Ceramics) were investigated. The addition of $3{\sim}10\;wt%$ ZBS glass ensured the sinterability below $900^{\circ}C$. In general, increasing ZBS glass content seemed to enhance the sinterability, but the quality factor($Qxf_{0}$) significantly decreased due to the formation of an excessive liquid and second phases. As for the addition of $TiO_{2}$, the dielectric constant(${\varepsilon}_{r}$) and temperature coefficient of resonant frequency(${\tau}_{f}$) showed to increase, while the quality factor($Qxf_{0}$) did not show an apparent change. The composition of $0.7xZnWO_{4}-0.3TiO_{2}$ ceramics sintered at $900^{\circ}C$ with 5 wt% ZBS glass demonstrated 21.6 in dielectric constant(${\varepsilon}_{r}$), 14,800 in quality factor($Qxf_{0}$), and $+5\;ppm/^{\circ}C$ in temperature coefficient of resonant frequency(${\tau}_{f}$).

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