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LaNiO2: Synthesis and structural characterization |
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| Authors: | M Crespin O Isnard F Dubois P Odier |
| Institution: | a Centre de Recherche sur la Matière Divisée, UMR CNRS-Université, 1 B rue de la Férollerie, 45071 Orléans Cedex 2, France b Laboratoire de Cristallographie, CNRS UPR 5031, 25 Avenue des Martyrs, BP166, 38042 Grenoble Cedex 09, France c Institut Universitaire de France, Maison des Universités, 103 boulevard Saint Michel, 75005 Paris, France d CRISMAT, UMR CNRS-ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France |
| Abstract: | The preparation of a single phase LaNiO2 by controlled H2 reduction of the perovskite LaNiO3 is reported. The different steps of the synthesis are detailed. The structural characterization is made by X-ray diffraction (XRD) and neutron powder diffraction (NPD) and discussed; the derived crystal structure is the infinite-layer CaCuO2. Both XRD and NPD patterns are characterized by anisotropic shape broadening originating from size effect linked to the reduction process. From NPD, the LaNiO2 powder is composed of platelet-like crystallites having an average thickness equal to 20 nm along the 001] direction. A modulation of the neutron diffraction background is observed and discussed in connection to the reduction process. |
| Keywords: | LaNiO2 Nickel monovalent Controlled reduction |
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