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http://dx.doi.org/10.4191/KCERS.2006.43.2.092

Low-Temperature Sintering and Dielectric Properties of BaSn(BO3)2 Ceramics  

Nam, Myung-Hwa (Department of Materials Science and Engineering, Korea University)
Kim, Hyo-Tae (Korea Institute of Ceramic Engineering and technology)
Hwang, June-Cheol (Department of Materials Science and Engineering, Korea University)
Nam, Joong-Hee (Korea Institute of Ceramic Engineering and technology)
Yeo, Dong-Hoon (Korea Institute of Ceramic Engineering and technology)
Kim, Jong-Hee (Korea Institute of Ceramic Engineering and technology)
Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.2, 2006 , pp. 92-97 More about this Journal
Abstract
Dolomite type $BaSn(BO_3)_2$ ceramics with rhombohedral crystal structure has been synthesized via solid state reaction route. Dielectric properties were measured for the samples sintered at $1050\~1200^{\circ}C$ for 2 h in air. Dielectric constant, loss tangent, and temperature coefficient were increased with sintering temperature due to the evolution of $BaSnO_3$, secondary, phase. Optimum dielectric properties were obtained at the $BaSn(BO_3)_2$ ceramics sintered at $1100^{\circ}C.\;CuO/Bi_2O_3$ was added to $BaSn(BO_3)_2$ ceramics to lower the sintering temperature for LTCC application, then Co and Fe-based coloring agents were added for colorizing the LTCC tape. Typical dielectric properties of $BaSn(BO_3)_2$ ceramics with $5 wt\%\;CuO/Bi_2O_3\;and\;3wt\%$ Co-coloring agent that sintered at $900^{\circ}C$ were $\varepsilon_r=9.89,\;tan{\delta}=0.92\times10^{-3},\;and\;TCC=112ppm/^{\circ}C$. Thus obtained LTCC tape was co-fired with Ag paste for compatibility test and revealed no sign of Ag reaction with the ceramics.
Keywords
LTCC; Dielectric properties; Co-fire; Compatibility;
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