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Enhanced Quality Factor of Zinc Lanthanum Borates‐Based Dielectrics via the Control of ZnO/B 2 O 3 Ratio
Author(s) -
Doo Sae Han Na,
Jo Yeon Hwa,
Lee Joon Seok,
Mohanty Bhaskar C.,
Sekhar Koppole C.,
Cho Yong Soo
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03411.x
Subject(s) - dielectric , materials science , crystallization , boron , zinc , softening point , lanthanum , porosity , dielectric loss , mineralogy , analytical chemistry (journal) , zinc borate , composite material , metallurgy , chemical engineering , inorganic chemistry , chemistry , optoelectronics , organic chemistry , chromatography , engineering , fire retardant
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·16La 2 O 3 ·(57–68)B 2 O 3 glass mixed with a fixed 50 wt% Al 2 O 3 filler. The ratio of ZnO/B 2 O 3 was found to be critical in controlling the nature of glass and, consequently, performance of the dielectric mixture. For example, 27ZnO·16La 2 O 3 ·57B 2 O 3 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., LaAl 2.03 (B 4 O 10 )O 0.54 and ZnAl 2 O 4 , are assumed to be responsible for better dielectric performance that resulted from the increase of Zn content in glass.