Preparation of mullite-based iron magnetic nanocomposite powders by reduction of solid solution

Hao Wang, Tohru Sekino, Koichi Niihara, Zhengyi Fu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this article, the preparation of mullite-based iron magnetic nanocomposite powders by hydrogen reduction of Fe-doped mullite solid solution with a nominal composition of Al5.4Fe0.6Si 2O13 is reported. The formation process of Al 5.4Fe0.6Si2O13 solid solution was analyzed using X-ray diffraction analysis (XRD), Fourier Transform Infrared Spectrum (FT-IR), thermogravimetric, and differential thermal analysis (TG-DTA). It is found that doping with Fe3+ cation affects the crystallization temperature of mullite. During the hydrogen reduction process, more than 89% Fe3+ cation in solid solution were transformed into α-Fe phase when reduction temperature reached 1200 °C. Microstructure characterization of nanocomposite powders reduced at 1300 °C reveals that there are two types of α-Fe particles in mullite matrix. Fe nanoparticles with a size of approximately 10 nm were precipitated within the mullite grains, while Fe particles larger than hundreds of nanometers were located at the surfaces of the mullite grains. The measurement of the magnetic properties of nanocomposite powders indicates that large particles and nanoparticles of α-iron have the ferromagnetic and superparamagnetic behavior at room temperature, respectively.

Original languageEnglish
Pages (from-to)2489-2496
Number of pages8
JournalJournal of Materials Science
Volume44
Issue number10
DOIs
Publication statusPublished - 2009 May 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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