title: Oxygen storage capacity and structural flexibility of LuFe2O4+x (0≤x≤0.5).
abstract: Combining functionalities in devices with high performances is a great challenge that rests on the discovery and optimization of materials. In this framework, layered oxides are attractive for numerous purposes, from energy conversion and storage to magnetic and electric properties. We demonstrate here the oxygen storage ability of ferroelectric LuFe2O4+x within a large x range (from 0 to 0.5) and its cycling possibility. The combination of thermogravimetric analyses, X-ray diffraction and transmission electron microscopy evidences a complex oxygen intercalation/de-intercalation process with several intermediate metastable states. This topotactic mechanism is mainly governed by nanoscale structures involving a shift of the cationic layers. The ferrite is highly promising because absorption begins at a low temperature (~=200 °C), occurs in a low oxygen pressure and the uptake of oxygen is reversible without altering the quality of the crystals. The storage/release of oxygen coupled to the transport and magnetic properties of LnFe2O4 opens the door to new tunable multifunctional applications.
authors.affiliation: Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Hervieu
authors.affiliation: Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Guesdon
authors.affiliation: 1] Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France [2] Laboratoire Léon Brillouin, UMR 12, CEA-Saclay, CEA-CNRS, 91191 Gif-sur-Yvette Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Bourgeois
authors.affiliation: Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin BP 48 91192 Gif-sur-Yvette Cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Elkaïm
authors.affiliation: Institut Charles Gerhardt UMR CNRS 5253, Université Montpellier II, Place E Bataillon, cc1503, 34095 Montpellier Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Poienar
authors.affiliation: Laboratoire Léon Brillouin, UMR 12, CEA-Saclay, CEA-CNRS, 91191 Gif-sur-Yvette Cedex, France.
authors.forename: F
authors.initials: F
authors.lastname: Damay
authors.affiliation: Institut Charles Gerhardt UMR CNRS 5253, Université Montpellier II, Place E Bataillon, cc1503, 34095 Montpellier Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Rouquette
authors.affiliation: Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Maignan
authors.affiliation: Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Martin