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Thermal decomposition of the black precipitate Cr 2 Mn 3 O 9  · aq at 1300 K leads to the dark brown spinel CrMn 1,5 O 4  (a = 847.9 pm; Z = 8; Fd3m). By magnetic measurements and model calculations from powder data of the spinel we propose the ionic distribution Cr IV [Mn II Mn IV  0,5 ]O 4  with x = 0.35.

zeitschrift für naturforschung b

Über einen Chrom-Mangan-Spinell mit Kationenmangelstruktur, CrMn 1,5 O 4  / About a Chromium Manganese Spinel with Cation Deficient Structure: CrMn 1,5 O 4