Abstract
A low melting point multi-component glass (Li2O-B2O3-SiO2-CaO-Al2O3) was incorporated into Zr non-stoichiometric substituted Ca[(Li1/3Nb2/3)]O3-δ ceramic to lower its sintering temperature for LTCC applications. The glass acts as liquid phase sintering aid and it can lower the sintering temperature of the ceramic from 1,170 °C to 900 °C. Dense and perovskite solid solutions can be obtained in all glass doped specimens with, however, a small amount of Ca2Nb2O7-type pyrochlore phase. Raman spectra indicate that the B-site 1:2 ordering structure in Ca[(Li1/3Nb2/3)0.95Zr0.15]O3+δ ceramic is gradually softened with the increase of the glass content and localized B-site 1:1 ordering domains begin to appear when the glass content reaches 15 wt%. The optimal microwave dielectric properties of εr = 29.37, Qf = 5,420 GHz and τf = −24.9 ppm/°C can be obtained in 5 wt% glass doped Ca[(Li1/3Nb2/3)0.95Zr0.15]O3+δ ceramic when sintered at 940 °C for 4 h. No chemical reaction exists between Ag and the above ceramic, which indicates itself a potential candidator in LTCC industry.
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Acknowledgments
The authors would like to thank the national science foundation of China (No. 61076049) for the financial support of the present work. The authors also appreciate the financial support from the Industry-University-Research Institute Foundation of Guangdong Province (No.2009B090300368) and the natural science foundation of Guangdong Province (No. 9151063101000040).
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Hu, M., Fu, Y., Zhou, D. et al. Influence of multi-component glass on sintering behavior and microwave properties of Zr non-stoichiometricly substituted Ca[(Li1/3Nb2/3)]O3-δ ceramic. J Mater Sci: Mater Electron 23, 1775–1782 (2012). https://doi.org/10.1007/s10854-012-0661-5
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DOI: https://doi.org/10.1007/s10854-012-0661-5