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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1355 (July) (2008)  >  pp.825-828

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1355 (July) (2008)   pp.825 - 828 Next article>>

Influences of alkali oxides on crystallization and dielectric properties of anorthite-based low temperature dielectrics

Yong Soo CHO1), Yeon Hwa JO1), Hong Rak CHOI1), Dong Wook SHIN1) and Kyung Won CHUNG2)
1) Department of Materials Science and Engineering, Yonsei University
2) DAION Co., Ltd.


  The influences of alkali oxides as glass constituents for producing LTCC (Low Temperature Co-fired Ceramics) materials were investigated in terms of variations in physical and dielectric parameters. The LTCC materials were based on typical calcium zinc aluminoborosilicate glasses containing 1-3.5 mol% alkali oxides such as K2O, Na2O and Li2O. All samples were prepared in the same experimental condition, i.e., the ratio of glass/filler and the final firing temperature of 850°C. Densification and crystallization behavior strongly depended on the type and amount of alkali oxides used. For example, crystallization peaks in the DTA curves tended to shift towards the lower temperature region by increasing the content of Na2O and K2O. Specifically, the effect of Li2O was distinct in determining the crystallization behavior and subsequent dielectric properties of the LTCC system. Dielectric constant was measured as values of 7.18-7.78 but dielectric loss was significantly degraded specifically with the addition of 3 mol% Li2O.


Keyword:
LTCC, Dielectric, Glass, Anorthite, Alkali oxide

Received: September 18, 2007
Accepted: May 15, 2008 , Published online: July 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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