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Manganese(IV) oxide is the inorganic compound with the formula MnO2. This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.
The principal use for MnO2 is for dry- cell batteries, such as the alkaline battery and the zinc-carbon battery.
MnO2 is also used as a pigment and as a precursor to other manganese compounds,such as KMnO4.It is used as a reagentin organic synthesis, for example, for the oxidation of allylic alcohols.
MnO2 in the α polymorph can in- corporate a variety of atoms (as well as water molecules) in the "tunnels" or "channels" between the manganese oxide octahedra.There is considerable interest in α-MnO2 as a possible cathode for lithium ion batteries.
The predominant application of MnO2 is as a component of dry cell batteries alkaline batteriesand so called Leclanché cell, or zinc –carbon batteries.
Other industrial applications include the use of MnO2 as an inorganic pigment in ceramics and in glassmaking.
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