Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mössbauer spectroscopy

Jun Kano, Takumi Okamoto, Shin Nakamura, Akio Fuwa, Takafumi Otoyama, Yoshiaki Nakazaki, Hideki Hashimoto, Jun Takada, Norihiro Oshime, Miho Ito, Naoshi Ikeda

    Research output: Contribution to journalArticle

    Abstract

    Various types of iron oxides loaded on ferroelectric BaTiO3 and nonferroelectric ZrO2 supports have been studied by 57Fe Mössbauer spectroscopy to investigate the valence instability of iron oxides affected by ferroelectric polarization fluctuation. Although the iron oxide loaded on ZrO2 shows a typical reduction process at high vacuum and high temperature, the iron oxide loaded on BaTiO3 shows an opposite process, i.e., iron oxide oxidization. We propose the dynamics of band structures of ferroelectrics in the paraelectric phase to understand this phenomenon. The oscillation of band bending causes electron transfer from an iron oxide to a ferroelectric support. This result suggests that the surface charges of ferroelectrics are useful in developing new functional materials with metal compounds.

    Original languageEnglish
    Article number05FB24
    JournalJapanese Journal of Applied Physics
    Volume53
    Issue number5 SPEC. ISSUE 1
    DOIs
    Publication statusPublished - 2014

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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  • Cite this

    Kano, J., Okamoto, T., Nakamura, S., Fuwa, A., Otoyama, T., Nakazaki, Y., Hashimoto, H., Takada, J., Oshime, N., Ito, M., & Ikeda, N. (2014). Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mössbauer spectroscopy. Japanese Journal of Applied Physics, 53(5 SPEC. ISSUE 1), [05FB24]. https://doi.org/10.7567/JJAP.53.05FB24