Magnetic properties and thermal behavior of mullite-iron nanocomposite powders

Hao Wang, Wei Min Wang, Zheng Yi Fu, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Mullite based iron magnetic nanocomposite powders were synthesized by reduction of sol-gel prepared mullite-iron oxide solid solution in hydrogen flow. Structural characterization studied by TEM revealed that two types of α-iron nanoparticles existed in mullite matrix. The α-iron nanoparticles with the size around hundreds of nanometers appeared as inter-type grains, while those around 10 nm were embedded in the grains of mullite. The magnetic properties of nanocomposites suggest that the intergranular and intragranular α-iron nanoparticles had the ferromagnetic and superparamagnetic behavior at room temperature, respectively. The oxidation behavior of nanocomposite powders showed that there existed two different oxidation stages of α-Fe nanoparticles.

Original languageEnglish
Pages (from-to)353-356
Number of pages4
JournalJournal of Electroceramics
Volume21
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - 2008 Dec

Keywords

  • Iron
  • Magnetic properties
  • Mullite
  • Nanocomposite
  • Oxidation behavior

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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