Topochemical nitridation of Sr2FeMoO6

Roberta Ceravola; Carlos Frontera; Judith Oró-Solé; Ashley P. Black; Clemens Ritter; Ignasi Mata; Elies Molins; Josep Fontcuberta; Amparo Fuertes

doi:10.1039/C8CC09845J

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Topochemical nitridation of Sr₂FeMoO₆†

Roberta Ceravola,

^a Carlos Frontera,^a Judith Oró-Solé,

^a Ashley P. Black,

^a Clemens Ritter,^b Ignasi Mata,

^ac Elies Molins,

^a Josep Fontcuberta

*^a and Amparo Fuertes

*^a

Author affiliations

* Corresponding authors

^a Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
E-mail: fontcuberta@icmab.cat, amparo.fuertes@icmab.es
Fax: +34 935805727
Tel: +34 935801853

^b Institut Laue-Langevin, 71 Avenue de Martyrs, Grenoble 38000, France

^c Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain

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 Sr₂FeMoO_4.9N_1.1 where double-exchange interactions determine ferromagnetic order with T_C ≈ 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.

This article is part of the themed collection: Perovskites

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Article information

DOI: https://doi.org/10.1039/C8CC09845J
Article type: Communication
Submitted: 12 Dec. 2018
Accepted: 13 Febr. 2019
First published: 13 Febr. 2019
This article is Open Access

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

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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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