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Soft X-Ray Absorption Spectroscopy as a Method to Study Y1–yCayBaCo4–xMxO7 Cobaltites (M = Fe, Zn)

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Abstract

Soft X-ray absorption spectroscopy has been used to determine the charge state and content of cobalt ions in doped cobaltites CaBaCo4O7, Y0.5Ca0.5BaCo4O7, Y0.5Ca0.5BaCo4–xFexO7, and Y0.5Ca0.5BaCo4–zZnzO7. A method has been proposed to determine the relative concentrations of cobalt ions in barium-containing cobaltites from the relative intensities of X-ray absorption Со L3/Ba M5 spectra, and the relative contents of both Fe and Zn doping elements and Co2+ and Co3+ ions have been determined. It has been found that the substitution of iron ions for some cobalt ions (cobaltite Y0.5Ca0.5BaCo4–xFexO7) transforms some Co3+ ions to Co2+ ions. It has been found that iron ions are in the 3+ charge state and have tetrahedral coordination with oxygen ions. The substitution of divalent zinc ions for some cobalt ions (cobaltite Y0.5Ca0.5BaCo4–zZnzO7) increases the concentration of high-spin Co3+ ions. The tetrahedral coordination of the Co2+ and Co3+ ions has been confirmed.

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620137, Russia

    V. R. Galakhov, S. N. Shamin & V. V. Mesilov

  2. Ural Federal University, Yekaterinburg, 620002, Russia

    V. R. Galakhov

Authors
  1. V. R. Galakhov
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  2. S. N. Shamin
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  3. V. V. Mesilov
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Correspondence to V. R. Galakhov.

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Original Russian Text © V.R. Galakhov, S.N. Shamin, V.V. Mesilov, 2018, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 107, No. 9, pp. 610–614.

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Galakhov, V.R., Shamin, S.N. & Mesilov, V.V. Soft X-Ray Absorption Spectroscopy as a Method to Study Y1–yCayBaCo4–xMxO7 Cobaltites (M = Fe, Zn). Jetp Lett. 107, 583–587 (2018). https://doi.org/10.1134/S0021364018090072

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  • DOI: https://doi.org/10.1134/S0021364018090072

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