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http://dx.doi.org/10.4313/JKEM.2006.19.6.524

Microwave Dielectric Properties of Ca(Li1/4Nb3/4)O3-CaTiO3 Ceramics added with Zinc-borosilicate Glass Frit  

Yoon Sang-Ok (강릉대학교 세라믹공학과)
Kim Kwan-Soo (강릉대학교 세라믹공학과)
Jo Tae-Hyun (강릉대학교 세라믹공학과)
Shim Sang-Heung (강원대학교 삼척캠퍼스 전기공학과)
Park Jong-Guk (강원대학교 삼척캠퍼스 전기공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.19, no.6, 2006 , pp. 524-530 More about this Journal
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(${\tau}_f$).
Keywords
LTCC; $Ca(Li_{1/4}Nb_{3/4})O_{3}$; $CaTiO_{3}$; Zinc-borosilicate; Dielectric constant;
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