Chemical bonding and valence state of 3d-metal ions in Ni1−xCoxCr2O4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data. Kochur, A. G., Kozakov, A. T., Googlev, K. A., Mikheykin, A. S., Torgashev, V. I., Bush, A. A., & Nikolskii, A. V. Journal of Electron Spectroscopy and Related Phenomena, 195:208–219, August, 2014. ![Chemical bonding and valence state of 3d-metal ions in Ni1−xCoxCr2O4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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.
@article{kochur_chemical_2014,
title = {Chemical bonding and valence state of 3d-metal ions in {Ni1}−{xCoxCr2O4} spinels from {X}-ray diffraction and {X}-ray photoelectron spectroscopy data},
volume = {195},
issn = {0368-2048},
url = {https://www.sciencedirect.com/science/article/pii/S0368204814001583},
doi = {10.1016/j.elspec.2014.07.010},
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.},
urldate = {2023-11-11},
journal = {Journal of Electron Spectroscopy and Related Phenomena},
author = {Kochur, A. G. and Kozakov, A. T. and Googlev, K. A. and Mikheykin, A. S. and Torgashev, V. I. and Bush, A. A. and Nikolskii, A. V.},
month = aug,
year = {2014},
keywords = {Crystal structure, NiCoCrO spinels, Valence state, X-ray diffraction, XPS},
pages = {208--219},
}
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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. 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