Back Mangaandioksied Afrikaans أكسيد المنغنيز الرباعي Arabic منقنز دیاوکسید AZB ম্যাঙ্গানিজ ডাইঅক্সাইড Bengali/Bangla Mangan(IV)-oksid BS Òxid de manganès(IV) Catalan Oxid manganičitý Czech Mangan(IV)-oxid German Óxido de manganeso(IV) Spanish منگنز دی‌اکسید Persian

Manganese dioxide

Manganese dioxide
Manganese(IV) oxideMn4O2
Names
IUPAC names
Manganese dioxide
Manganese(IV) oxide
Other names
Pyrolusite, hyperoxide of manganese, black oxide of manganese, manganic oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.821 Edit this at Wikidata
EC Number
  • 215-202-6
RTECS number
  • OP0350000
UNII
  • InChI=1S/Mn.2O checkY
    Key: NUJOXMJBOLGQSY-UHFFFAOYSA-N checkY
  • O=[Mn]=O
Properties
MnO
2
Molar mass 86.9368 g/mol
Appearance Brown-black solid
Density 5.026 g/cm3
Melting point 535 °C (995 °F; 808 K) (decomposes)
Insoluble
+2280.0×10−6 cm3/mol[1]
Structure[2]
Tetragonal, tP6, No. 136
P42/mnm
a = 0.44008 nm, b = 0.44008 nm, c = 0.28745 nm
2
Thermochemistry[3]
54.1 J·mol−1·K−1
53.1 J·mol−1·K−1
−520.0 kJ·mol−1
−465.1 kJ·mol−1
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H302, H332
P261, P264, P270, P271, P301+P312, P304+P312, P304+P340, P312, P330, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
2
1
2
OX
Flash point 535 °C (995 °F; 808 K)
Safety data sheet (SDS) ICSC 0175
Related compounds
Other anions
 Manganese disulfide
Other cations
 Technetium dioxide
Rhenium dioxide
Manganese(II) oxide
Manganese(II,III) oxide
Manganese(III) oxide
Manganese heptoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

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. The principal use for MnO
2 is for dry-cell batteries, such as the alkaline battery and the zinc–carbon battery.[4] MnO
2 is also used as a pigment and as a precursor to other manganese compounds, such as KMnO
4. It is used as a reagent in organic synthesis, for example, for the oxidation of allylic alcohols. MnO
2 has an α-polymorph that can incorporate 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-MnO
2 as a possible cathode for lithium-ion batteries.[5][6]

  1. ^ Rumble, p. 4.71
  2. ^ Haines, J.; Léger, J.M.; Hoyau, S. (1995). "Second-order rutile-type to CaCl2-type phase transition in β-MnO2 at high pressure". Journal of Physics and Chemistry of Solids. 56 (7): 965–973. Bibcode:1995JPCS...56..965H. doi:10.1016/0022-3697(95)00037-2.
  3. ^ Rumble, p. 5.25
  4. ^ Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. pp. 1218–20. ISBN 978-0-08-022057-4..
  5. ^ Barbato, S (31 May 2001). "Hollandite cathodes for lithium ion batteries. 2. Thermodynamic and kinetics studies of lithium insertion into BaMMn7O16 (M=Mg, Mn, Fe, Ni)". Electrochimica Acta. 46 (18): 2767–2776. doi:10.1016/S0013-4686(01)00506-0. hdl:10533/173039.
  6. ^ Tompsett, David A.; Islam, M. Saiful (25 June 2013). "Electrochemistry of Hollandite α-MnO : Li-Ion and Na-Ion Insertion and Li Incorporation". Chemistry of Materials. 25 (12): 2515–2526. CiteSeerX 10.1.1.728.3867. doi:10.1021/cm400864n.

Developed by StudentB