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http://dx.doi.org/10.4191/KCERS.2006.43.1.055

Low Temperature Sintering and Microwave Dielectric Properties of Ca[Ti1-x(Ni1/3Nb2/3)x]O3 Ceramics  

Lee, Young-Gyu (Department of Ceramic Engineering, Hanyang University)
Kim, Hyo-Tae (Korea Institute of Ceramic Engineering and Technology)
Nam, Joong-Hee (Korea Institute of Ceramic Engineering and Technology)
Kim, Jong-hee (Korea Institute of Ceramic Engineering and Technology)
Paik, Ungyu (Department of Ceramic Engineering, Hanyang University)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.1, 2006 , pp. 55-61 More about this Journal
Abstract
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.
Keywords
LTCC; Microwave; Dielectric properties;
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