Doping γ-Fe2O3 nanoparticles with Mn(III) suppresses the transition to the α-Fe2O3 structure

Jriuan Lai, Kurikka V.P.M. Shafi, Katja Loos, Abraham Ulman, Yongjae Lee, Thomas Vogt, Claude Estournès

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79 Citations (Scopus)

Abstract

Here we report on a mixed oxide system, γ-Fe2O3 nanoparticles doped with Mn(III), where the transition from the cubic to the more stable hexagonal α-Fe2O3 structure is suppressed. When amorphous Fe2O3 is heated at 300 °C for 3 h, ferrimagnetic γ-Fe2O3 is observed as the sole product. On the other hand, when the temperature is raised to 500 °C, one observes only antiferromagnetic α-Fe2O3 as the product. However, upon doping with 8.5 wt % Mn(III), the amorphous nanoparticles crystallized to mainly the γ-Fe2O3 matrix after heating at 500 °C for 3 h, and need to be heated to >650 °C for the complete transition to the α-Fe2O3 structure to take place.

Original languageEnglish
Pages (from-to)11470-11471
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number38
DOIs
Publication statusPublished - 2003 Sep 24

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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