Ordered Mesoporous Fe2O3 With Crystalline Walls

J Feng, A Harrison, J C Jumas, W Kockelmann, A V Chadwick, Peter George Bruce

Research output: Contribution to journalArticlepeer-review

378 Citations (Scopus)

Abstract

alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.

Original languageEnglish
Pages (from-to)5468-5474
Number of pages7
JournalJournal of the American Chemical Society
Volume128
Issue number39
DOIs
Publication statusPublished - 26 Apr 2006

Keywords

  • HEMATITE NANOPARTICLES
  • MAGNETIC-PROPERTIES
  • MORIN TRANSITION
  • MOLECULAR-SIEVES
  • METAL-OXIDES
  • IRON-OXIDE
  • TEMPERATURE
  • ALPHA-FE2O3
  • PARTICLES
  • MOSSBAUER

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