Enhanced magnetic coercivity of α-Fe2O3 obtained from carbonated 2-line ferrihydrite

  • B. Vallina
  • J. D. Rodriguez-Blanco
  • A. P. Brown
  • L. G. Benning
  • J. A. Blanco
Research Paper


We report the physical properties of α-Fe2O3 (hematite), synthesized by dry-heating (350–1,000 °C) of a new, poorly ordered iron oxyhydroxide precursor compound that we name carbonated 2-line ferrihydrite. This precursor was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, electron microscopy, and thermogravimetric analysis, whereas the α-Fe2O3 was studied with X-ray diffraction, scanning and transmission electron microscopy, and magnetic techniques. α-Fe2O3 synthesized at 350 °C consisted of single-nanocrystal particles (length × width 20 ± 6 nm (L) × 15 ± 4 nm (W)), which at room temperature exhibited very narrow hysteresis loops of low coercivities (<300 Oe). However, α-Fe2O3 synthesized at higher temperatures (1,000 °C) was composed of larger nanocrystalline particle aggregates (352 ± 109 nm (L) × 277 ± 103 nm (W)) that also showed wide-open hysteresis loops of high magnetic coercivities (~5 kOe). We suggest that these synthesis-temperature-dependent coercivity values are a consequence of the subparticle structure induced by the different particle and crystallite size growth rates at increasing annealing temperature.


Hematite Ferrihydrite High coercivity Carbonate Microstructure 



This research was supported by the Spanish Ministry of Economy and Competitivity (MICINN-12-MAT2011-27573-C04-02) and the Marie Curie EU-FP6 MINGRO Research and Training Network under contract MRTNCT-2006-035488. The authors would like to thank the Cohen Laboratories at the School of Earth and Environment and the Leeds Electron Microscopy and Spectroscopy Centre (LEMAS) at the Faculty of Engineering (University of Leeds). The help of David Martínez Blanco (Scientific-Technical Services of the University of Oviedo, Spain) with the magnetic measurements is also acknowledged.

Supplementary material

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Supplementary material 1 (PDF 671 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • B. Vallina
    • 1
    • 2
  • J. D. Rodriguez-Blanco
    • 1
    • 3
  • A. P. Brown
    • 4
  • L. G. Benning
    • 1
  • J. A. Blanco
    • 2
  1. 1.School of Earth and EnvironmentUniversity of LeedsLeedsUK
  2. 2.Departamento de FísicaUniversidad de OviedoOviedoSpain
  3. 3.Department of Chemistry, Nano-Science CenterUniversity of Copenhagen H.C Oersted InstituteKopenhagenDenmark
  4. 4.Faculty of Engineering, Institute for Materials ResearchSPEME, University of LeedsLeedsUK

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