IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
A new LaCo0.71(1)V 0.29(1)O2.97(3) perovskite containing vanadium in octahedral sites: synthesis and structural and magnetic characterization
Autor/es:
VALERIA C. FUERTES; MARÍA CECILIA BLANCO; DIEGO G. FRANCO; SERGIO CEPPI; RODOLFO D. SÁNCHEZ; MARÍA TERESA FERNÁNDEZ-DÍAZ; GERMÁN TIRAO; RAÚL E. CARBONIO
Revista:
DALTON TRANSACTIONS
Editorial:
ROYAL SOC CHEMISTRY
Referencias:
Lugar: CAMBRIDGE; Año: 2015 vol. 44 p. 10721 - 10727
ISSN:
1477-9226
Resumen:
In the course of an investigation to prepare the hypothetic new double perovskite La3Co2VO9 with Co2+ and V5+ in octahedral sites, we obtained the new simple perovskite LaCo0.71(1)V0.29(1)O2.97(3) as the main phase. The pure compound was then synthesized by the citrate decomposition method. The crystal structure was studied by X-ray (PXRD) and powder neutron diffraction (PND). Physical properties were characterized by X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and thermogravimetric analysis (TGA). Rietveld refinements were performed in the orthorhombic space group Pnma (#62). Refined cell parameters were a = 5.4762(2) A, b = 7.7609(2) A and c = 5.5122(1) A. Magnetization measurements showed that this perovskite is an antiferromagnet with a Neel temperature of 15 K. At high T the magnetization follows the Curie-Weiss law corrected by temperature independent paramagnetism (TIP) showing an effective magnetic moment of 3.03[small mu ]B well described by the contribution of Co2+ (HS), Co3+ (IS), V3+ and V4+ ions. The crystallographic formula was refined by PND and oxidation state distribution was determined by the combination of PND, XAS, TGA and magnetic measurements.