TY - JOUR
T1 - Magnetic and electrical properties of Eu2VO4
AU - Ramanujachary, K. V.
AU - Sunstrom IV, J. E.
AU - Fawcett, I.
AU - Shuk, P.
AU - Greenblatt, M.
AU - Croft, M.
AU - Nowik, I.
AU - Herber, R. H.
AU - Khalid, S.
N1 - Funding Information:
We thank Professor McCarroll for critically reading the manuscript and for his useful suggestions. We also thank the reviewer of our manuscript for his many useful comments, which greatly improved the final version of this paper. This work was supported by National Science Foundation Solid State Chemistry Grant DMR-93-14605 and DMR-96-13106. K.V.R. acknowledges funding from Research Corporation Grant CC4366.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999/3/15
Y1 - 1999/3/15
N2 - Eu2VO4 with the K2NiF4-type structure was prepared by heating Eu2O3, V2O5, 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 VO6 octahedra with V-O bond distances of 1.928(1) angstrom (× 4) and 2.04(2) angstrom (× 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 Mossbauer spectroscopy data. Variable temperature electrical resistivity measurements indicated that the sample was insulating (ρRT ≈ 104 Ω-cm). The compound undergoes a charge-ordering transition associated with the Eu sublattice at 445 K, as evidenced by Mossbauer spectroscopy, electrical resistivity, and in situ high temperature X-ray diffraction studies.
AB - Eu2VO4 with the K2NiF4-type structure was prepared by heating Eu2O3, V2O5, 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 VO6 octahedra with V-O bond distances of 1.928(1) angstrom (× 4) and 2.04(2) angstrom (× 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 Mossbauer spectroscopy data. Variable temperature electrical resistivity measurements indicated that the sample was insulating (ρRT ≈ 104 Ω-cm). The compound undergoes a charge-ordering transition associated with the Eu sublattice at 445 K, as evidenced by Mossbauer spectroscopy, electrical resistivity, and in situ high temperature X-ray diffraction studies.
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U2 - 10.1016/S0025-5408(99)00063-X
DO - 10.1016/S0025-5408(99)00063-X
M3 - Article
AN - SCOPUS:0344339072
SN - 0025-5408
VL - 34
SP - 803
EP - 816
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 5
ER -