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Manganese dioxide is the inorganic compound with the formula MnO 2.This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.
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Together with manganese sulfate, MnO is a component of fertilizers and food additives. Many thousands of tons are consumed annually for this purpose. Other uses include: a catalyst in the manufacture of allyl alcohol, ceramics, paints, colored glass, bleaching tallow and textile printing.
Birnessite (nominally MnO 2 ·nH 2 O), also known as δ-MnO 2, is a hydrous manganese dioxide mineral with a chemical formula of Na 0.7 Ca 0.3 Mn 7 O 14 ·2.8H 2 O. [5] It is the main manganese mineral species at the Earth's surface, and commonly occurs as fine-grained, poorly crystallized aggregates in soils, sediments, grain and rock coatings (e.g., desert varnish), and marine ferromanganese ...
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Mn 2 O 3 is unlike many other transition metal oxides in that it does not adopt the corundum (Al 2 O 3) structure. [5] Two forms are generally recognized, α-Mn 2 O 3 and γ-Mn 2 O 3, [10] although a high pressure form with the CaIrO 3 structure has been reported too.
One of the more studied manganese oxide-based cathodes is LiMn 2 O 4, a cation ordered member of the spinel structural family (space group Fd3m). In addition to containing inexpensive materials, the three-dimensional structure of LiMn
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