A new LaCo0.71(1)V0.29(1)O2.97(3) perovskite containing vanadium in octahedral sites: synthesis and structural and magnetic characterization

FUERTES V. C.; M. C. BLANCO; D. G. FRANCO; CEPPI, S.; SÁNCHEZ R.D.; FERNÁNDEZ-DÍAZ, M. T.; TIRAO, G.; CARBONIO R. E

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2015

n 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 thermo- gravimetric analysis (TGA). Rietveld refinements were performed in the orthorhombic space group Pnma (#62). Refined cell parameters were a = 5.4762(2) Å, b = 7.7609(2) Å and c = 5.5122(1) Å. 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 3.03μB well described by the contrib