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 journalArticle

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 languageEnglish
Pages (from-to)529-534
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume58
Issue number9
DOIs
Publication statusPublished - Sep 2011

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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

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