Preparation and Characteristics of Bi0.5Na0.5TiO3 Single-Crystalline Films by a Solid-State Process

Authors

  • Daiji Ijuu,

    1. Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan
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  • Toshio Kimura,

    Corresponding author
    1. Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan
      †Author to whom correspondence should be addressed. e-mail: kimura@applc.keio.ac.jp
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    • *Member, The American Ceramic Society.

  • Tomoaki Yamada,

    1. Department of Innovative and Engineering Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan
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  • Hiroshi Funakubo

    1. Department of Innovative and Engineering Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan
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    • *Member, The American Ceramic Society.


  • D. Lupascu—contributing editor

†Author to whom correspondence should be addressed. e-mail: kimura@applc.keio.ac.jp

Abstract

A novel process was demonstrated for the preparation of an epitaxial Bi0.5Na0.5TiO3 (BNT) single-crystalline film on a SrTiO3 single crystal substrate by simply heating a composite consisting of a BNT powder layer on the substrate. The BNT powder layer was formed on the substrate by spin coating and the composite was heated at 1150°C for several hours in a lidded crucible containing the BNT powder to avoid evaporation of Na and Bi from the composite. This yielded an epitaxial BNT single-crystalline film several micrometers thick. The film had a high degree of orientation with the rocking curve full width at half maximum of 0.064°. The mechanism of film formation was found to be solid-state spreading of BNT powder particles on the substrate, and a dense film was obtained from the porous powder layer.

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