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, Part 1: Regular Papers and Short Notes and Review Papers
Volume53
Issue number5 SPEC. ISSUE 1
DOIs
Publication statusPublished - 2014

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Iron oxides
iron oxides
Ferroelectric materials
Spectroscopy
valence
spectroscopy
Functional materials
metal compounds
Surface charge
high vacuum
Band structure
electron transfer
Vacuum
Polarization
oscillations
Electrons
causes
polarization
Metals
Temperature

ASJC Scopus subject areas

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

Cite this

Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mössbauer spectroscopy. / Kano, Jun; Okamoto, Takumi; Nakamura, Shin; Fuwa, Akio; Otoyama, Takafumi; Nakazaki, Yoshiaki; Hashimoto, Hideki; Takada, Jun; Oshime, Norihiro; Ito, Miho; Ikeda, Naoshi.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 53, No. 5 SPEC. ISSUE 1, 05FB24, 2014.

Research output: Contribution to journalArticle

Kano, Jun ; Okamoto, Takumi ; Nakamura, Shin ; Fuwa, Akio ; Otoyama, Takafumi ; Nakazaki, Yoshiaki ; Hashimoto, Hideki ; Takada, Jun ; Oshime, Norihiro ; Ito, Miho ; Ikeda, Naoshi. / Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mössbauer spectroscopy. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2014 ; Vol. 53, No. 5 SPEC. ISSUE 1.
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AU - Nakazaki, Yoshiaki

AU - Hashimoto, Hideki

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AU - Ikeda, Naoshi

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