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Phase Evolution and Microwave Dielectric Properties of Lanthanum Borate‐Based Low‐Temperature Co‐Fired Ceramics Materials
Author(s) -
Seo Yong Jun,
Shin Dong Joo,
Cho Yong Soo
Publication year - 2006
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.1551-2916.2006.01035.x
Subject(s) - lanthanum , dielectric , materials science , ceramic , boron , phase (matter) , microwave , mineralogy , dielectric loss , analytical chemistry (journal) , composite material , inorganic chemistry , chemistry , optoelectronics , organic chemistry , physics , quantum mechanics
A new potential low‐temperature co‐fired ceramics (LTCC) system based on a simple lanthanum borate (La 2 O 3 –B 2 O 3 ) glass was investigated with regard to phase development and microwave dielectric properties as functions of alumina filler content less than 50 wt% and firing temperature up to 1050°C. Unexpected crystalline phases, such as La(BO 2 ) 3 , LaAl 2.03 (B 4 O 10 )O 0.54 , LaBO 3 , and Al 20 B 4 O 36 , developed during the firing process are likely responsible for substantial resultant changes in physical and microwave dielectric properties. As a specific example, a high‐quality factor of 785 at 15.8 GHz obtained for a composition containing 30 wt% alumina supports the hypothesis that the phase‐dielectric property relation exists in this LTCC system. On a practical basis, two phases of LaAl 2.03 (B 4 O 10 )O 0.54 and LaBO 3 must be important in determining the final dielectric performance by manipulating the ratios of glass and filler and by selecting a desirable temperature.