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J. Korean Ceram. Soc. > Volume 41(6); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(6): 444.
doi: https://doi.org/10.4191/kcers.2004.41.6.444
결정화유리의 첨가에 의한 BNT계 세라믹스의 저온소결 및 마이크로파 유전특성
허동수, 이우석1, 정순종2, 송재성2, Futoshi Ustuno3, 류봉기
부산대학교 무기재료공학과
1부산대학교 무기재료공학
2한국전기연구원 전자기소자연구그
3일본 동경대학교 생산기술연구
Sintering and Dielectric Properties of BaO-Nd2O3-TiO2 Microwave Ceramics with Glass-Ceramics
ABSTRACT
The microwave dielectric properties of low temperature sintered BaO-Nd$_2$O$_3$-TiO$_2$ (here after BNT) with a Pb-based glass-ceramics were studied in order to investigate their applicability to Low Temperature Co-fired Ceramics (LTCC) for fabrication of multilayered Radio Frequency (RF) passive components module. The BNT ceramics, with 5∼30 wt% of PbO-TiO$_2$-A1$_2$O$_3$-SiO$_2$ based glass-ceramics, were sintered at 105$0^{circ}C$, which is lower than 130$0^{circ}C$, sintering temperature of pure BNT ceramics. With increasing the amount of the glass-ceramics, sintering rate of the ceramics become activated due to the softening of glass, resulting in low-temperature densification. BaO-Nd$_2$O$_3$-TiO$_2$ microwave ceramics with 20 wt% glass-ceramics exhibit sintered relative densities over 95% and dielectric constant of 72, quality factor of 1500, and temperature coefficient of frequency of +22 ppm/$^{circ}C$. This enhanced dielectric properties are attributed to mainly the presence of crystalline phases PbTiO$_3$ within the Pb-based glass.
Key words: BaO-Ndsos-$TiO_2$, Glass-Ceramics, Low Temperature Co-Fired Ceramics (LTCC)
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