Synthesis and mechanical/magnetic properties of nano-grained iron-oxides prepared with an inert gas condensation and pulse electric current sintering process

Yong Ho Choa, Tatachika Nakayama, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Nanocrystalline iron-oxide powder was fabricated with an inert gas condensation (IGC) method combined with evaporation, and in-situ oxidation techniques. The particle size of iron-oxide powder was controlled by varying the helium gas pressure between 0.1 and 10 Torr, with the smallest one ≈10 nm at 0.1 Torr. The nanostructure was characterized by TEM. Nanocrystalline iron-oxide powder was sintered with the pulse electric current sintering (PECS) method to obtain densified γ-Fe2O3 materials, and suitably densified nano-grained γ-Fe2O3 materials (≈ 40 nm) of great hardness were obtained. The correlation between the nanostructure and magnetic properties of nanocrystalline powder and densified γ-Fe2O3 materials was also investigated.

Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalMetals and Materials International
Volume5
Issue number2
DOIs
Publication statusPublished - 1999 Jan 1

Keywords

  • Inert gas condensation method
  • Magnetic property
  • Mechanical property
  • Nanostructure
  • Pulse electric current process

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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