Magnetic and electrical properties of Eu{sub 2}VO{sub 4}
- Rutgers-the State Univ., Piscataway, NJ (United States)
- Hebrew Univ., Jerusalem (Israel). Racah Inst. of Physics
- Brookhaven National Lab., Upton, NY (United States). National Synchrotron Light Source
Eu{sub 2}VO{sub 4} with the K{sub 2}NiF{sub 4}-type structure was prepared by heating Eu{sub 2}O{sub 3}, V{sub 2}O{sub 5}, and V metal at 1473 K in an evacuated silica ampoule. Rietveld refinement of the powder X-ray diffraction (XRD) data confirmed the presence of layers of corner-shared VO{sub 6} octahedra with V-O bond distances of 1.928(1) {angstrom} ({times} 4) and 2.04 ({times} 2) perpendicular to the tetragonal c axis. X-ray absorption near-edge spectroscopy (XANES) indicated that the Eu is mixed-valent [Eu(II)/Eu(III)], while vanadium exists exclusively in the trivalent state. These valence assignments were supported by the results of temperature-dependent magnetic susceptibility and Moessbauer spectroscopy data. Variable temperature electrical resistivity measurements indicated that the sample was insulating ({rho}{sub RT} {approx} 10{sup 4} {Omega}-cm). The compound undergoes a charge-ordering transition associated with the Eu sublattice at 445 K, as evidenced by Moessbauer spectroscopy, electrical resistivity, and in situ high temperature X-ray diffraction studies.
- OSTI ID:
- 679194
- Journal Information:
- Materials Research Bulletin, Vol. 34, Issue 5; Other Information: PBD: 15 Mar 1999
- Country of Publication:
- United States
- Language:
- English
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