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Study of the Morin Transition in Pseudocubic α-Fe2O3 Particles

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Abstract

We have studied the Morin transition in nanostructured pseudocubic α-Fe2O3 particles of about 1.8 μm side. The preparation was carefully chosen to obtain a system with a very narrow crystallite size distribution and particles of homogeneous morphology. Two samples were studied: one without thermal treatment (α-Fe2O3(ap)) and another annealed at 673 K in air for 12 h (α-Fe2O3(an)). Both were characterized by XRD, SEM, TGA and Mössbauer spectroscopy. The results indicate that the Morin transition is suppressed for α-Fe2O3(ap), however, α-Fe2O3(an) has a T M ≈ 230 K and the transition is completed over a very narrow temperature range. These results are discussed in connection with the crystallite size, the cell parameters, and the presence of OH− groups (hydrohematite) or incorporated water (protohematite).

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Authors and Affiliations

  1. CINDECA, Facultad de Ciencias Exactas, UNLP, CICBA, CONICET., Calle 47 No. 257, 1900, La Plata, Argentina

    J. F. Bengoa & S. G. Marchetti

  2. Centro Atómico Bariloche, 8400 San Carlos de Bariloche, Bariloche, Argentina

    M. S. Moreno

  3. Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000, Gent, Belgium

    R. E. Vandenberghe

  4. Departamento de Física, IFLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 1900, La Plata, Argentina

    R. C. Mercader

Authors
  1. J. F. Bengoa
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  2. M. S. Moreno
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  3. S. G. Marchetti
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  4. R. E. Vandenberghe
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  5. R. C. Mercader
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Correspondence to R. C. Mercader.

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Bengoa, J.F., Moreno, M.S., Marchetti, S.G. et al. Study of the Morin Transition in Pseudocubic α-Fe2O3 Particles. Hyperfine Interact 161, 177–183 (2005). https://doi.org/10.1007/s10751-005-9180-6

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  • DOI: https://doi.org/10.1007/s10751-005-9180-6

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