New ferromagnetic La3Co2TaO9 double perovskite: Structural and magnetic properties |
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Authors: | VC Fuertes MC Blanco DG Franco JM De Paoli EV Pannunzio Miner RD Snchez MT Fernndez-Díaz RE Carbonio |
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Institution: | aINFIQC, Dpto. de Fisicoquímica, Fac. de Ciencias Químicas, U.N.C., Córdoba 5000, Argentina;bLaboratorio de Resonancias Magnéticas. Centro Atómico Bariloche, Bariloche 8400, Río Negro, Argentina;cInstitut Max Von Laue Paul Langevin, F-38042, Grenoble Cedex 9, France |
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Abstract: | The new double perovskite La3Co2TaO9 has been prepared by a solid-state procedure. The crystal and magnetic structures have been studied from X-ray powder diffraction (XRPD) and neutron powder diffraction (NPD) data. Rietveld refinements were performed in the monoclinic space group P21/n. The structure consists of an ordered array of alternating B′O6 and B″O6 octahedra sharing corners, tilted along the three pseudocubic axes according to the Glazer notation a−b−c+. Rietveld refinements show that at RT the cell parameters are a=5.6005(7) Å, b=5.6931(7) Å, c=7.9429(9) Å and β=89.9539(7)°, and the refined crystallographic formula of this “double perovskite” can be written as La2(Co)2d(Co1/3Ta2/3)2cO6. Magnetization measurements and low-temperature NPD data show that the perovskite is a ferromagnet with TC=72 K. At high T it follows the Curie–Weiss law with an effective magnetic moment of 3.82μB per Co ion which is very close to spin only Co2+ (HS). |
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Keywords: | Double perovskite Crystal structure refinement Rietveld method Ferromagnetism Magnetic characterization |
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