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

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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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Authors and Affiliations

  1. AIST, National Institute of Advanced Industrial Science and Technology, Midorigaoka 1–8–31, Ikeda, 563–8577, Osaka, Japan

    Tomonari Takeuchi & Hiroyuki Kageyama

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  1. Tomonari Takeuchi
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  2. Hiroyuki Kageyama
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Takeuchi, T., Kageyama, H. Preparation of BaTiO3/SrTiO3 composite dielectric ceramics with a flat temperature dependence of permittivity. Journal of Materials Research 18, 1809–1815 (2003). https://doi.org/10.1557/JMR.2003.0251

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  • DOI: https://doi.org/10.1557/JMR.2003.0251

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