CAS number : 1313-13-9
Molecular weight :86.94
Molecular formula/chemical symbol :MnO2
Description :
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 reagent in organic synthesis, for example, for the oxidation of allylic alcohols.
Several polymorphs of MnO2 are claimed, as well as a hydrated form. Like many other dioxides, MnO2 crystallizes in the rutile crystal structure (this polymorph is called β-MnO2), with three-coordinate oxide and octahedral metal centres. MnO2 is characteristically nonstoichiometric, being deficient in oxygen. The complicated solid-state chemistry of this material is relevant to the lore of "freshly prepared" MnO2 in organic synthesis.
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Manganese dioxide |
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Manganese
oxide |
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Other names |
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Identifiers |
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14117 |
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Jmol-3D images |
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· O=[Mn]=O |
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· InChI=1S/Mn.2O |
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Properties |
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MnO2 |
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86.9368 g/mol |
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Appearance |
Brown-black solid |
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5.026 g/cm3 |
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535 °C (decomposes) |
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Solubility in water |
insoluble |
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Thermochemistry |
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Std enthalpy of |
?520 kJ·mol?1[1] |
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Standard molar |
53 J·mol?1·K?1[1] |
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Hazards |
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EU Index |
025-001-00-3 |
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Harmful (Xn) |
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535 °C |
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Related compounds |
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Other anions |
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Other cations |
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Manganese(II) oxide |
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USES :
Depolarizing agent, good decolorizing agent in the glass industry, used in
dry-cell batteries,
Match industry the accelerant, ceramic, enamel glaze raw materials and
manganese salts
For pyrotechnics, water purification, in addition to iron, pharmaceuticals,
fertilizers and fabric dyeing.
Keywords:Electronic chemicals;Fine ceramics
Report :
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Product name |
Manganese dioxide |
CAS：1313-13-9 |
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Description |
Black orthorhombic system crystals or brown-black powder |
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TEST ITEMS |
TEST RESULTS |
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MnO2 |
92.18 |
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Fe |
0.015 |
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Cu |
0.0005 |
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Co |
0.0010 |
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Ni |
0.0006 |
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Pb |
0.0007 |
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H2O |
1.42 |
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