Crystal and magnetic structure and cation distribution of Mn{sub 2-x}V{sub 1+x}O{sub 4} spinels (x = 0, 1/3 and 1)
- INFIQC-CONICET, Departamento de Fisicoquimica, Facultad de Ciencias Quimicas, Universidad Nacional de Cordoba, 5000 Cordoba (Argentina)
- Centro Atomico Bariloche, Comision Nacional de Energia Atomica, 8400 Bariloche (Argentina)
We synthesized the spinel-type compounds belonging to the Mn{sub 2-x}V{sub 1+x}O{sub 4} series with x = 0, 1/3 and 1 as polycrystalline powders. Crystal and magnetic structures were refined using synchrotron X-ray and neutron powder diffraction. At 300 K all members crystallize in the cubic system, space group Fd3-bar m, and show a structural transition at low temperature, changing to a tetragonal symmetry (space group I4{sub 1}/amd). Cations distributions between octahedral and tetrahedral sites were refined from neutrons diffraction (ND) data and explained based on crystal field stabilization energies (CFSE) and ionic radii. The magnetic unit cell is the same as the crystallographic one, having identical symmetry relations. The magnetic structure was refined as an arrangement of collinear spins, antiferromagnetically ordered, parallel to the c-axis of the unit cell. The refined site magnetic moments are smaller than those obtained from hysteresis cycles of the M vs. H measurements, indicating that some non-collinear disordered component coexists with the ordered component along the c-axis.
- OSTI ID:
- 22029813
- Journal Information:
- Materials Research Bulletin, Vol. 44, Issue 7; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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