Preparation and magnetization of hematite nanocrystals with amorphous iron oxide layers by hydrothermal conditions

G. S. Li, R. L. Smith, H. Inomata, K. Arai

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Hematite nanocrystals modified with surface layers of amorphous hydrous iron oxides were prepared by hydrothermal conditions in the absence of alkali. The formation temperature was found to be ca. 130°C. When the temperature was lower than 130°C, no product was formed, while above this temperature, the amount of amorphous hydrous iron oxides at the surface of hematite nanocrystals was drastically decreased. The amorphous layers on the hematite nanocrystals obtained at 130°C were determined to be Fe2O3·1.64H2O. The coercivity for the hematite nanocrystals with modified layers was 0.534 kOe, which is slightly larger than the values for hematite nanocrystals with few agglomerations.

Original languageEnglish
Pages (from-to)949-955
Number of pages7
JournalMaterials Research Bulletin
Volume37
Issue number5
DOIs
Publication statusPublished - 2002 Apr 1

Keywords

  • A. Oxides
  • B. Chemical synthesis
  • D. Magnetic properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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