Cationic superstructures and incommensurate magnetic structure in SbVO4 catalyst

6th Meeting of the Spanish Neutron Scattering Association

Hernández-Velasco, J.^1 ; Vilanova-Martínez, P.^1 ; García-García, J.^2 ; Landa-Cánovas, A.R.^1

Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Madrid

E-28049, Spain^1

Centro de Microscopía Electrónica, University Complutense de Madrid (CME-UCM), Madrid

28040, Spain^2

关键词: Diffraction techniques;    Incommensurate magnetic structures;    Magnetic neutron scattering;    Magnetic susceptibility measurements;    Propagation vector;    Reducing conditions;    Short range ordering;    Structure modulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/549/1/012025/pdf
DOI  :  10.1088/1742-6596/549/1/012025

来源: IOP

【 摘 要 】

Chemical and magnetic structure modulations in antimony vanadium mixed oxide with composition Sb0.92V1.08O4prepared in reducing conditions are studied using diffraction techniques, mainly nuclear and magnetic neutron scattering, electron and X-ray powder diffraction. Magnetic susceptibility measurements show possible magnetic order of V3+magnetic moments that is confirmed with neutron diffraction at TN∼50K. The average commensurate nuclear cell belongs to the tetragonal rutile structural type with cell constants: a=4.6066(11)Å and c=3.0812(8)Å at 60K. However the nature of the magnetic structure is incommensurate with propagation vector k= [0, 0, ± 0.266(1)] related to short range order phenomena and V-Sb alternating occupancy along the crystallographic c-axis.