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Preparation of BaTiO3/SrTiO3 composite dielectric ceramics with a flat temperature dependence of permittivity

Published online by Cambridge University Press:  31 January 2011

Tomonari Takeuchi  and
Hiroyuki Kageyama
Tomonari Takeuchi
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST, Midorigaoka 1–8–31, Ikeda, Osaka 563–8577, Japan
Hiroyuki Kageyama
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST, Midorigaoka 1–8–31, Ikeda, Osaka 563–8577, Japan
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Abstract

Composite dielectric ceramics of BaTiO3/SrTiO3 were prepared using the spark plasma sintering (SPS) method. Relatively dense (>92% of the theoretical x-ray density) composite ceramics were obtained for a relatively short sintering time (∼3 min). Such a short sintering time was advantageous in suppressing the formation of a complete solid solution (Ba, Sr)TiO3. Fixed-frequency (100 kHz), room-temperature permittivity measurements of the BaTiO3/SrTiO3 = 9/1 composites showed a flat temperature dependence within the range 30–110 °C. X-ray diffractometry measurements showed that the current SPS-BaTiO3/SrTiO3 composites consisted of BaTiO3 and small amounts of (Ba1−xSrx)TiO3 with various x values having different phase transition temperatures. Such multicomponent microstructures would be responsible for the flat temperature dependence of permittivity.

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Articles
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Journal of Materials Research , Volume 18 , Issue 8 , August 2003 , pp. 1809 - 1815
Copyright
Copyright © Materials Research Society 2003

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