EPJ Web of Conferences
Volume 40, 2013JEMS 2012 – Joint European Magnetic Symposia
|Number of page(s)||4|
|Section||Perovskites and multiferroics|
|Published online||14 January 2013|
Charge compensation and magnetic properties in Sr and Cu doped La-Fe perovskites
INSTM R.U. and Department of Engineering, University of
Bergamo, Dalmine, BG, I-24044
2 CNR - Istituto di Scienze e Tecnologie Molecolari (ISTM), 20133 Milano, Italy
3 INSTM R.U. Firenze and Department of Chemistry, University of Florence, I-50019 Sesto Fiorentino, Italy
4 Center for Neutron Research, NIST, Gaithersburg, MD, USA
5 Department of Materials Science and Engineering, University of Maryland, College Park, MD20742-2115, USA
6 CEA, Centre de Saclay, Service de Physique de l'Etat Condensé, 91191 Gif-sur-Yvette, France
Orthorhombic lanthanum orthoferrites La0.8Sr0.2Fe1-yCuyO3-w (y = 0 and 0.10) have been studied using X-rays and neutron powder diffraction (XRPD and NPD), magnetization measurements and 57Fe Mössbauer spectroscopy. Rietveld refinements on XRPD and NPD data show that they adopt an orthorhombic ABO3 perovskite symmetry with La/Sr and Fe/Cu atoms randomly distributed on crystal A and B sites, respectively. The magnetic structure at room temperature is antiferromagnetic, with the Fe/Cu magnetic moments aligned along the a axis. Magnetization curves versus temperature show that the compounds exhibit an overall antiferromagnetic and a weak ferromagnetic behaviour in the range 5-298 K. 57Fe Mössbauer spectroscopy measurements indicate that Fe3+ and Fe5+ ions coexist in both compounds, and the relative percentage of Fe5+ is almost the same at 77 and 170 K, rejecting a charge disproportion mechanism.
© Owned by the authors, published by EDP Sciences, 2013
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