Issue 21, 2019

Topochemical nitridation of Sr2FeMoO6


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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Article information

Article type
12 Dec 2018
13 Feb 2019
First published
13 Feb 2019
This article is Open Access
Creative Commons BY-NC license

Chem. Commun., 2019,55, 3105-3108

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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