Plastic deformation of BaTiO3 ceramics by high-pressure torsion and changes in phase transformations,optical and dielectric properties

Kaveh Edalati, Masashi Arimura, Yoshifumi Ikoma, Takeshi Daio, Moriji Miyata, David J. Smith, Zenji Horita

    研究成果: ジャーナルへの寄稿学術誌査読

    53 被引用数 (Scopus)

    抄録

    Ceramics are generally brittle at ambient condition and they can hardly be deformed plastically. In this study,severe plastic deformation was successfully imposed on barium titanate ceramic powders by high-pressure torsion. A tetragonal-to-cubic phase transformation occurred,and the fraction and stability of the cubic phase increased by straining because of the formation of nanograins. BaTiO3 exhibited photoluminescence and the yellow intensity increased after straining because of the formation of large fraction of grain boundaries. The dielectric constant of BaTiO3 was unusually increased by nanograin formation while the Curie temperature remained constant.

    本文言語英語
    ページ(範囲)216-221
    ページ数6
    ジャーナルMaterials Research Letters
    3
    4
    DOI
    出版ステータス出版済み - 7月 2015

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)

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