Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Microwave Dielectric Properties of Ca(Li1/4Nb3/4)O3-CaTiO3 Ceramics added with Zinc-borosilicate Glass Frit

Zinc-borosilicate Glass Frit 첨가에 따른 Ca(Li1/4Nb3/4)O3-CaTiO3 세라믹스의 마이크로파 유전 특성

  • 윤상옥 (강릉대학교 세라믹공학과) ;
  • 김관수 (강릉대학교 세라믹공학과) ;
  • 조태현 (강릉대학교 세라믹공학과) ;
  • 심상흥 (강원대학교 삼척캠퍼스 전기공학과) ;
  • 박종국 (강원대학교 삼척캠퍼스 전기공학과)
  • Published : 2006.06.01
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Abstract

$xCa(Li_{1/4}Nb_{3/4})O_{3}-(1-x)CaTiO_{3}$ ceramics were sintered under the presence of zinc-borosilicate(ZBS) glass and resultant microwave dielectric properties were investigated with a view to applying the composition to low-temperature co-fired ceramic(LTCC) technology. The addition of $5{\sim}15wt%$ ZBS glass ensured successful sintering below $900\;^{\circ}C$. In general, increased addition of ZBS glass increased sinterability but it decreased the quality factor($Q{\times}f_{0}$) significantly due to the formation of an excessive liquid and second phases. As for the addition of $CaTiO_3$, the dielectric constant(${\epsilon}_r$) and temperature coefficient of resonant frequency(${\tau}_f$) increased, while the quality factor($Q{\times}f_{0}$) did not show an apparent change. The sintered $0.9Ca(Li_{1/4}Nb_{3/4})O_{3}-0.1CaTiO_{3}$ specimen at $900\;^{\circ}C$ with 10 wt% ZBS glass demonstrated 39.6 in dielectric constant(${\epsilon}_r$), 4,400 in quality factor$(Q{\times}f_{0}),\;and\;-11ppm/^{\circ}C$ in temperature coefficient of resonant frequency(${\tau}_f$).

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References

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