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The title compound, tetrasodium nonamanganese octadecaoxide, Na4.32Mn9O18, was synthesized by reacting Mn2O3 with NaCl. One Mn atom occupies a site of 2/m symmetry, while all other atoms sit on mirror planes. The compound is isostructural with Na4Ti4Mn5O18 and suggestive of Mn3+/Mn4+ charge ordering. It has a double‐tunnel structure built up from double and triple chains of MnO6 octahedra and single...
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