Abstract
The oxidation state of manganese in the Nd2−xSr1+xMn2O7−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+xSr2−xMn2O7−δ.
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