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January 28th, 2010

Enhanced Quality Factor of Zinc Lanthanum Borates-Based Dielectrics via the Control of ZnO/B2O3 Ratio

Published on January 28th, 2010 | By: pwray@ceramics.org

Volume 93 Issue 2, Pages 334 – 337


Sae Han Na Doo, Yeon Hwa Jo, Joon Seok Lee, Bhaskar C. Mohanty, Koppole C. Sekhar, Yong Soo Cho
Published Online: Dec 3 2009 4:25PM
DOI: 10.1111/j.1551-2916.2009.03411.x



A dielectric system having an exceptionally high-quality factor of 1350 at 16.8 GHz is reported as a strong candidate for glass-based low-temperature cofireable materials. The dielectrics are based on unusual (16-27)ZnO·16La2O3·(57-68)B2O3 glass mixed with a fixed 50 wt% Al2O3 filler. The ratio of ZnO/B2O3 was found to be critical in controlling the nature of glass and, consequently, performance of the dielectric mixture. For example, 27ZnO·16La2O3·57B2O3 glass sample having the highest Zn content resulted in the lowest softening temperature of 647°C and the least porosity of ∼6%. The enhanced densification and extensive crystallization of low loss phases, i.e., LaAl2.03(B4O10)O0.54 and ZnAl2O4, are assumed to be responsible for better dielectric performance that resulted from the increase of Zn content in glass.


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