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Über Oxidhydroxide des vierwertigen Mangans mit Schichtengitter. 1. Mitteilung. Natriummangan (II,III)manganat(IV)
Authors:R. Giovanoli,E. St  hli,W. Feitknecht
Affiliation:R. Giovanoli,E. Stähli,W. Feitknecht
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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