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A Mössbauer spectroscopic study of cobalt-iron molybdates

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Abstract

Fe x Co1−x MoO4 compounds prepared by coprecipitation were studied by XRD, electrical conductivity and mainly by absorption and emission Mössbauer spectroscopy. FeMoO4 and CoMoO4 samples were shown to contain Fe3+ and Co3+, respectively, in solid solution. Three kinds of Fe x Co1−x MoO4 solids can be described. Forx⩽0.16: one has a Β-Co(Fe2+, Fe3+)MoO4 solid solution. For 0.17⩽x⩽0.25: one has the same solid solution with its surface rich in Fe3+. Forx⩾0.26: one has the same solid solution with only bulk Fe3+, and ferric molybdate. Studies of reduction by hydrogen and of catalytic reaction of mechanical mixtures of CoMoO4 and ferric molybdate support these statements.

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Authors and Affiliations

  1. Institut de Recherches sur la Catalyse, CNRS, Conventionné avec l'Université Claude Bernard, Lyon I, 69626, Villeurbanne, Cédex, France

    B. BenaÏchouba, P. Bussière & J. C. Védrine

  2. Laboratoire de Spectroscopie des Matériaux. Ecole Normale Supérieure de Mostaganem, BP 227, 27000, Mostaganem, Algeria

    B. BenaÏchouba

Authors
  1. B. BenaÏchouba
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  2. P. Bussière
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  3. J. C. Védrine
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BenaÏchouba, B., Bussière, P. & Védrine, J.C. A Mössbauer spectroscopic study of cobalt-iron molybdates. Hyperfine Interact 99, 367–387 (1996). https://doi.org/10.1007/BF02274941

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  • DOI: https://doi.org/10.1007/BF02274941

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