Calcium Aluminoborosilicate-Based Dielectrics Containing CaCu3Ti4O12 as a Filler

High dielectric constant (k) CaCu3Ti4O12 (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 compositi...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2010-08, Vol.93 (8), p.2334-2338
Main Authors: 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
Format: Article
Language:English
Subjects:
Calcium
Calcium aluminate
CERAMICS
COPPER OXIDE
Deltas
Densification
DIELECTRIC CONSTANT
Fillers
Firing
Glass
GLASSES
INSULATION (ELECTRICAL)
SILICATES
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Summary:High dielectric constant (k) CaCu3Ti4O12 (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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2010.03744.x