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Issue 21, 2019
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Topochemical nitridation of Sr2FeMoO6

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Abstract

The topotactic nitridation of cation ordered, tetragonal Sr2FeMoO6 in NH3 at moderate temperatures leads to cubic, Fm[3 with combining macron]m double perovskite oxynitride Sr2FeMoO4.9N1.1 where double-exchange interactions determine ferromagnetic order with TC ≈ 100 K. Substitution of oxide by nitride induces bond asymmetries and local electronically driven structural distortions, which combined with Fermi level lowering restricts charge itinerancy to confined regions and preclude spontaneous long-range magnetic order. Under a magnetic field, ferromagnetic correlations expand, favoring charge delocalization and a negative magnetoresistance is observed.

Graphical abstract: Topochemical nitridation of Sr2FeMoO6

  • This article is part of the themed collection: Perovskites
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Publication details

The article was received on 12 Dec 2018, accepted on 13 Feb 2019 and first published on 13 Feb 2019


Article type: Communication
DOI: 10.1039/C8CC09845J
Chem. Commun., 2019,55, 3105-3108
  • Open access: Creative Commons BY-NC license
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    Topochemical nitridation of Sr2FeMoO6

    R. Ceravola, C. Frontera, J. Oró-Solé, A. P. Black, C. Ritter, I. Mata, E. Molins, J. Fontcuberta and A. Fuertes, Chem. Commun., 2019, 55, 3105
    DOI: 10.1039/C8CC09845J

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