New LaCo0.71(1)V0.29(1)O2.97(3) perovskite containing vanadium in octahedral site: synthesis, structural and magnetic characterization

VALERIA C. FUERTES; MARÍA CECILIA BLANCO; DIEGO G. FRANCO; SERGIO CEPPI; RODOLFO D. SÁNCHEZ; MARÍA TERESA FERNÁNDEZ-DÍAZ; GERMÁN TIRAO; RAÚL E. CARBONIO

DALTON TRANSACTIONS

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2015 vol. 44 p. 10721 - 10721

1477-9226

n the course of an investigation to prepare the hypothetic new double perovskite La3Co2VO9 with Co2+ and V5+ in octahedral sites we obtain the new simple perovskite LaCo0.71(1)V0.29(1)O2.97(3) as the main phase. The pure compound has then 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 (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 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 uB well described by the contrib