Über Oxidhydroxide des vierwertigen Mangans mit Schichtengitter. 1. Mitteilung. Natriummangan (II,III)manganat(IV) |
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Authors: | R. Giovanoli,E. St hli,W. Feitknecht |
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Affiliation: | R. Giovanoli,E. Stähli,W. Feitknecht |
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Abstract: | The preparation of Na4Mn14O27, 9H2O (hitherto named manganomanganite or δ-MnO2) by oxidation of a fresh Mn(OH)2 suspension in aqueous NaOH by molecular oxygen, and its probable structure are described. It is a double layer manganate (IV) structure resembling other manganates such as chalcophanite. Orthorhombic unit cell parameters are, a0 = 8,54, b0 = 15,39, c0 = 14,26 Å. In diluted nitric acid topotactical transition to manganese (III) manganate (IV), Mn7O13.5H2O (unit cell: a0 = 2,84, c0 = 7,27 Å; primitively hexagonal), and by prolonged digestion to nsutite, γ-MnO2, occurs. |
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