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Calcium Aluminoborosilicate‐Based Dielectrics Containing CaCu 3 Ti 4 O 12 as a Filler
Author(s) -
Kim Byeong Kon,
Lee Dong Wook,
Key Sung Hun,
Jo Tae Jin,
Jeong Seong Min,
Kim Kwang Jin,
Jeon Min Seok,
Song Jun Kwang,
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.1551-2916.2010.03744.x
Subject(s) - dielectric , materials science , dielectric loss , composite material , ceramic , calcium , filler (materials) , atmospheric temperature range , mineralogy , metallurgy , chemistry , thermodynamics , optoelectronics , physics
High dielectric constant ( k ) CaCu 3 Ti 4 O 12 (CCTO) has been studied as a potential filler for low‐temperature cofired ceramics (LTCC) based on typical calcium aluminoborosilicate glass. CCTO does not appear to be chemically reactive with the glass regardless of the firing temperature over the compositional range of 30–90 wt% CCTO. Dielectric constant and dielectric loss turned out to depend strongly on the relative content of CCTO and firing temperature. As an optimal composition, the glass with 60 wt% CCTO exhibited a k ∼32 and tan δ∼0.01 as a result of firing at 850°C, which is preferably applicable for the medium k LTCC applications. The higher content of 90 wt% CCTO needed to be densified at 900°C for better densification with a higher dielectric constant of ∼150. However, the 900°C firing was not acceptable for the 30 and 60 wt% CCTO‐containing samples due to the unexpected expansion of samples leading to significantly enlarged pores.