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A temperature and magnetic field dependence Mössbauer study of ɛ-Fe2O3

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Abstract

ɛ-Fe2O3 was synthesized as nanoparticles by a pre-vacuum heat treatment of yttrium iron garnet (Y3Fe5O12) in a silica matrix at 300°C followed by sintering in air at 1,000°C for up to 10 h. It displays complex magnetic properties that are characterized by two transitions, one at 480 K from a paramagnet (P) to canted antiferromagnet (CAF1) and the second at ca. 120 K from the canted antiferromagnet (CAF1) to another canted antiferromagnet (CAF2). CAF2 has a smaller resultant magnetic moment (i.e. smaller canting angle) than CAF1. Analysis of the zero-field Mössbauer spectra at different temperatures shows an associated discontinuity of the hyperfine field around 120 K. In an applied field, the different magnetic sublattices were identified and the directions of their moments were assigned. The moments of the two sublattices are antiparallel and collinear at 160 K but are at right angle to each other at 4.2 K.

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Authors and Affiliations

  1. Groupe des Matériaux Inorganiques, Institut de Physique et Chimie des Matériaux de Strasbourg, 23 rue du Loess, 67034, Strasbourg Cedex, France

    J.-L. Rehspringer & S. Vilminot

  2. Faculty of Natural Sciences, Department of Inorganic Chemistry, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic

    D. Niznansky

  3. Institute of Inorganic Chemistry, ASCR, Rez near Prague, Czech Republic

    D. Niznansky

  4. Faculty of Mathematics and Physics, Institute of Physics and Joint Laboratory of Mössbauer Spectroscopy, Charles University, V Holešovičkách 2, Prague 8, Czech Republic

    K. Zaveta

  5. CIRIMAT, UMR 5085 CNRS – UPS – INP, 118 route de Narbonne, 31062, Toulouse Cedex 04, France

    C. Estournes

  6. Laboratoire de Chimie de Coordination Organique, CNRS-UMR7140, Tectonique Moléculaire de solide, Institut Le Bel, Université Louis Pasteur, 4 rue Blaise Pascal, 67000, Strasbourg, France

    M. Kurmoo

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  1. J.-L. Rehspringer
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  2. S. Vilminot
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  3. D. Niznansky
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  4. K. Zaveta
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  5. C. Estournes
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  6. M. Kurmoo
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Correspondence to J.-L. Rehspringer.

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Rehspringer, JL., Vilminot, S., Niznansky, D. et al. A temperature and magnetic field dependence Mössbauer study of ɛ-Fe2O3 . Hyperfine Interact 166, 475–481 (2005). https://doi.org/10.1007/s10751-006-9311-8

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  • DOI: https://doi.org/10.1007/s10751-006-9311-8

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