New ferromagnetic La3Co2TaO9 double perovskite: Structural and magnetic properties
- Fuertes, Valeria Cintia
- Blanco, Marìa Cecilia
- Franco, Diego Gaspar
- de Paoli, Juan Martin
- Pannunzio Miner, Elisa Victoria
- Sanchez, Rodolfo Daniel
- Fernández Díaz, M. T.
- Carbonio, Raul Ernesto
DOIAbstract
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-tempera...
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