Abstract
The oxidation state of manganese in the Nd2−x Sr1+x Mn2O7−δ solid solution was determined by X-ray photoelectron spectroscopy and by calculating the oxygen nonstoichiometry based on the gravimetric data. As a result of the heterovalent replacement of Nd3+ with Sr2+, the change in the oxidation state of manganese occurs in different ways, i.e., it increases at x > 0 and decreases at x < 0. In the latter case, some oxygen ions acquire the oxidation state of −1. The samples slowly cooled under oxidative conditions possess a significant positive oxygen non-stoichiometry, which tends to decrease after Nd3+ is replaced with Sr2+. An excess of oxygen stabilizes the crystal structure of Nd1+x Sr2−x Mn2O7−δ.
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Original Russian Text © A.M. Yankin, A.V. Fetisov, O.M. Fedorova, L.B. Vedmid’, 2013, published in Fizika i Khimiya Stekla.
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Yankin, A.M., Fetisov, A.V., Fedorova, O.M. et al. State of manganese atoms in the Nd1+x Sr2−x Mn2O7−δ solid solution. Glass Phys Chem 39, 73–76 (2013). https://doi.org/10.1134/S1087659613010148
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DOI: https://doi.org/10.1134/S1087659613010148