info:eu-repo/semantics/article
New ferromagnetic La3Co2TaO9 double perovskite: Structural and magnetic properties
Fecha
2009-10Registro en:
Fuertes, Valeria Cintia; Blanco, Marìa Cecilia; Franco, Diego Gaspar; de Paoli, Juan Martin; Pannunzio Miner, Elisa Victoria; et al.; New ferromagnetic La3Co2TaO9 double perovskite: Structural and magnetic properties; Elsevier Science; Physica B: Condensed Matter; 404; 18; 10-2009; 2717-2719
0921-4526
CONICET Digital
CONICET
Autor
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
Resumen
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).