Formation mechanism of a bixbyite β-Fe2O3

Teruaki Danno; Yoshihiro Kusano; Hiroshi Asaoka; Makoto Nakanishi; Tatsuo Fujii; Yasunori Ikeda; Jun Takada

doi:10.2497/jjspm.58.529

Formation mechanism of a bixbyite β-Fe₂O₃

Teruaki Danno, Yoshihiro Kusano, Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Yasunori Ikeda, Jun Takada

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Formation mechanism of β-Fe₂O₃ particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO₄)₂ and Na₃Fe(SO₄) ₃ to NaCl and the heat treatment temperature. The heat treatment temperature strongly affected the particle shapes and sizes. β-Fe ₂O₃ was found to be formed by two different reactions; one is a solid state reaction below 490 °C, and another is a liquid phase-mediated reaction above 490 °C. β-Fe₂O₃ had granular shape with a diameter of about 50 to 100nm below 490°C, while at high temperatures above 490°C cubic particles with relatively large size of about 500 nm to 2μm were produced. We found that this dramatically change of particle morphology including their sizes and shapes was caused by the effects of the liquid phase in the reaction.

Original language	English
Pages (from-to)	529-534
Number of pages	6
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	58
Issue number	9
DOIs	https://doi.org/10.2497/jjspm.58.529
Publication status	Published - Sept 2011

Keywords

Fine particle
Formation mechanism
Iron oxide
Sodium iron sulfate

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.2497/jjspm.58.529

Cite this

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title = "Formation mechanism of a bixbyite β-Fe2O3",

abstract = "Formation mechanism of β-Fe2O3 particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO4)2 and Na3Fe(SO4) 3 to NaCl and the heat treatment temperature. The heat treatment temperature strongly affected the particle shapes and sizes. β-Fe 2O3 was found to be formed by two different reactions; one is a solid state reaction below 490 °C, and another is a liquid phase-mediated reaction above 490 °C. β-Fe2O3 had granular shape with a diameter of about 50 to 100nm below 490°C, while at high temperatures above 490°C cubic particles with relatively large size of about 500 nm to 2μm were produced. We found that this dramatically change of particle morphology including their sizes and shapes was caused by the effects of the liquid phase in the reaction.",

keywords = "Fine particle, Formation mechanism, Iron oxide, Sodium iron sulfate",

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AU - Danno, Teruaki

AU - Kusano, Yoshihiro

AU - Asaoka, Hiroshi

AU - Nakanishi, Makoto

AU - Fujii, Tatsuo

AU - Ikeda, Yasunori

AU - Takada, Jun

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