Manganese(III) oxide is a chemical compound with the formulation Mn2O3.
Preparation and chemistry[edit]
Heating MnO2 in air at under 800 °C produces α-Mn2O3 (increased temperatures produce Mn3O4).[3] γ-Mn2O3 might be produced by oxidation adopted by dehydration of manganese(II) hydroxide.[3] Many preparations of nano-crystalline Mn2O3 have been reported, for instance syntheses involving oxidation of MnII salts or discount of MnO2.[4][5][6]
Manganese(III) oxide is fashioned by the redox response in an alkaline cell:
Manganese(III) oxide Mn2O3 should not be confused with MnOOH manganese(III) oxyhydroxide. Opposite to Mn2O3, MnOOH is a compound that decomposes at about 300 °C to type MnO2.[7]
Construction[edit]
Mn2O3 is not like many different transition metallic oxides in that it doesn’t undertake the corundum (Al2O3) construction.[3] Two kinds are typically acknowledged, α-Mn2O3 and γ-Mn2O3,[8] though a excessive strain type with the CaIrO3 construction has been reported too.[9]
α-Mn2O3 has the cubic bixbyite construction, which is an instance of a C-type uncommon earth sesquioxide (Pearson image cI80, house group Ia3, #206). The bixbyite construction has been discovered to be stabilised by the presence of
small quantities of Fe3+, pure Mn2O3 has an orthorhombic construction (Pearson image oP24, house group Pbca, #61).[10] α-Mn2O3 undergoes antiferromagnetic transition at 80 Okay. [11]
γ-Mn2O3 has a construction associated to the spinel construction of Mn3O4 the place the oxide ions are cubic shut packed. That is much like the connection between γ-Fe2O3 and Fe3O4.[8] γ-Mn2O3 is ferrimagnetic with a Néel temperature of 39 Okay.[12]
References[edit]
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– “magnesium 3 oxide”