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J. Korean Ceram. Soc. > Volume 43(1); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(1): 55.
doi: https://doi.org/10.4191/kcers.2006.43.1.055
Ca[Ti1-x(Ni1/3Nb2/3)x]O3 세라믹스의 저온소결 및 마이크로파 유전특성
이영규, 김효태1, 남중희1, 김종희1, 백운규
한양대학교 세라믹공학과
1요업기술원 시스템모듈사업단
Low Temperature Sintering and Microwave Dielectric Properties of Ca[Ti1-x(Ni1/3Nb2/3)x]O3 Ceramics
Young-Gyu Lee, Hyo-Tae Kim1, Joong-Hee Nam1, Jong-hee Kim1, Ungyu Paik
Department of Ceramic Engineering, Hanyang University
1Korea Institute of Ceramic Engineering and Technology
The microwave dielectric properties and low temperature sintering of $Ca[Ti_{1-x}(Ni_{1/3}Nb_{2/3})_x]O_3$ system were investigated at the sintering temperature $1,200~1,350^{circ}C$. The density and quality factors $(Q{times}f)$ increased while dielectric constants slightly decreased with the decrease of Ti. The dielectric constant, quality factor, and temperature coefficient of resonance frequency $(tau_f)$ were 64, 17,000 GHz, and $-9.1;ppm/^{circ}C$ respectively, when $CaTi_{1/2}(Ni_{1/3}Nb_{2/3})_{1/2}O_3$ ceramics were sintered at $1,300^{circ}C$ for 4 h. $2Li_2O-B_2O_3$ was added to $CaTi_{1/2}(Ni_{1/3}Nb_{2/3})_{1/2}O_3$ to decrease the sintering temperature for LTCC application. The microwave dielectric properties of the samples sintered at $925^{circ}C$ for 2 h with the addition of $6;wt%;2Li_2O-B_2O_3$ were $varepsilon_r=48.7,;Q{times}f=8,460;GHz$, and $tau_f=+5.6ppm/^{circ}C$. Compatibility test of the composition with silver electrode shows no reaction with silver electrode, implying the feasibility as a high-K LTCC material.
Key words: LTCC, Microwave, Dielectric properties
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