Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data
Andrei Kochur
1
,
A. T. KOZAKOV
2
,
K A Googlev
2
,
A S Mikheykin
3
,
V.I. Torgashev
3
,
A. A. Bush
4
,
Publication type: Journal Article
Publication date: 2014-08-01
scimago Q2
wos Q3
SJR: 0.601
CiteScore: 3.6
Impact factor: 1.5
ISSN: 03682048, 18732526
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
Spectroscopy
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Radiation
Abstract
Ni1−xCoxCr2O4 solid solution samples with х = 0, 0.005, 0.01, 0.02, 0.3, 0.5, 0.8 and 1 are studied by the methods of X-ray diffraction and X-ray photoelectron spectroscopy (XPS). Ni2p3/2,1/2, Co2p3/2,1/2, Cr2p3/2,1/2, and O1s spectra are measured. The spectra are calculated with allowance for multiplet splitting, crystal field, and charge-transfer effect. Ni2+ ions are found to be present in tetrahedral and octahedral positions. Relative numbers of Ni2+ ions in tetrahedral and octahedral sites are determined via fitting the experimental spectra with superposition of the spectra of Ni2+ ions calculated in tetrahedral and octahedral crystal field. Cobalt ions are bivalent and occupy mostly tetrahedral sites. Chromium ions are trivalent and occupy predominantly octahedral positions. However, due to a defective lattice, the samples may contain Cr ions in non-equivalent states, either chemically or structurally.
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Kochur A. et al. Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data // Journal of Electron Spectroscopy and Related Phenomena. 2014. Vol. 195. pp. 208-219.
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Kochur A., KOZAKOV A. T., Googlev K. A., Mikheykin A. S., Torgashev V., Bush A. A., Nikolskii A. Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data // Journal of Electron Spectroscopy and Related Phenomena. 2014. Vol. 195. pp. 208-219.
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TY - JOUR
DO - 10.1016/j.elspec.2014.07.010
UR - https://doi.org/10.1016/j.elspec.2014.07.010
TI - Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data
T2 - Journal of Electron Spectroscopy and Related Phenomena
AU - Kochur, Andrei
AU - KOZAKOV, A. T.
AU - Googlev, K A
AU - Mikheykin, A S
AU - Torgashev, V.I.
AU - Bush, A. A.
AU - Nikolskii, A.V.
PY - 2014
DA - 2014/08/01
PB - Elsevier
SP - 208-219
VL - 195
SN - 0368-2048
SN - 1873-2526
ER -
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@article{2014_Kochur,
author = {Andrei Kochur and A. T. KOZAKOV and K A Googlev and A S Mikheykin and V.I. Torgashev and A. A. Bush and A.V. Nikolskii},
title = {Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data},
journal = {Journal of Electron Spectroscopy and Related Phenomena},
year = {2014},
volume = {195},
publisher = {Elsevier},
month = {aug},
url = {https://doi.org/10.1016/j.elspec.2014.07.010},
pages = {208--219},
doi = {10.1016/j.elspec.2014.07.010}
}