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Issue 3, 1981
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Topochemically controlled hydrogen reduction of scheelite-related rare-earth metal molybdates

Abstract

Scheelite-related α-Ln2Mo3O12(Ln = La, Pr, Nd, Sm, Gd, Tb, or Dy) oxides are reduced by hydrogen at 780–870 K yielding molybdenum (IV) oxides of formula Ln2Mo3O9. The latter crystallize in a tetragonal scheelite (ABO4) type structure where one third of the A sites and a quarter of the anion sites are vacant: Ln2/3(□cat)1/3MoO3(□an). The reaction Ln2Mo3O12+ 3H2 Ln2Mo3O9(□an)3+ 3H2O may be regarded as topochemically controlled, since both the parent and the product phases have scheelite-related structures. Infrared spectra and electrical and magnetic properties of these metastable defect scheelite phases are reported.

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Article type: Paper
DOI: 10.1039/DT9810000668
J. Chem. Soc., Dalton Trans., 1981, 668-672

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    Topochemically controlled hydrogen reduction of scheelite-related rare-earth metal molybdates

    J. Gopalakrishnan and A. Manthiram, J. Chem. Soc., Dalton Trans., 1981, 668
    DOI: 10.1039/DT9810000668

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