New LaCo0.71V0.29O2.97 perovskite containing vanadium in octahedral site: synthesis, structural and magnetic characterization

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

DALTON TRANSACTIONS

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2015

1477-9226

The new perovskite LaCo0.71V0.29O2.97 has been synthesized by the citrate decomposition method. The crystal structure has been studied by X-ray (PXRD) and neutron powder diffraction (PND). Physical properties were characterized by X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and thermogravimetric measurements (TG). 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 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 B well described by the contribution of Co2+ (HS), Co3+ (IS), V3+ and V4+ ions. The crystallographic formula was refined by PND and oxidation states distribution was determined by the combination of PND, XAS, TG and magnetic measurements.