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Dielectric Properties of Low Permittivity BST-Mg2TiO4 Composite Ceramics

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Abstract:

100(1-y)wt%Ba0.50Sr0.50TiO3—100ywt%Mg2TiO4 (BST-MT, y=0.76, 0.8, 0.82, marked as S1, S2, S3) composite ceramics with low permittivity (ε<60) were prepared by a traditional solid reaction method. The microstructure and dielectric properties of BST-MT composite ceramics were investigated. With the content of MT increasing, the dielectric peaks of BST-MT were depressed and broadened, thus the thermal stability was improved. However, the tunability declined with y increasing. In order to offset the temperature sensitivity, we obtained an Electrical field-Temperature (E-T) relationship by changing the dc bias field within a wide temperature range so that we could keep the tunability at a fixed value (3%). Such result explored a new route to compensate the temperature sensitivity of BST system in designing tunable microwave devices

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Periodical:

Materials Science Forum (Volume 687)

Pages:

257-262

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.687.257

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Online since:

June 2011

Authors:

Cheng Liu, Xiao Gang Lu, Chang Jie Gao, Hui Xia Jing, Lin Cheng, Peng Liu

Keywords:

BST, Ceramic, Low Permittivity

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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