Manganese(III) oxide

Manganese(III) oxide
Names
Other names
dimanganese trioxide, manganese sesquioxide, manganic oxide, manganous oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.878 Edit this at Wikidata
RTECS number
  • OP915000
UNII
  • InChI=1S/2Mn.3O ☒N
    Key: GEYXPJBPASPPLI-UHFFFAOYSA-N ☒N
  • InChI=1/2Mn.3O/rMn2O3/c3-1-5-2-4
    Key: GEYXPJBPASPPLI-YNHMASKPAU
  • O=[Mn]O[Mn]=O
Properties
Mn2O3
Molar mass 157.8743 g/mol
Appearance brown or black crystalline
Density 4.50 g/cm3
Melting point 888 °C (1,630 °F; 1,161 K) (alpha form)
940 °C, decomposes (beta form)
0.00504 g/100 mL (alpha form)
0.01065 g/100 mL (beta form)
Solubility insoluble in ethanol, acetone
soluble in acid, ammonium chloride
+14,100·10−6 cm3/mol
Structure[1]
Bixbyite, cI80
Ia3 (No. 206)
a = 942 pm
Thermochemistry
110 J·mol−1·K−1[2]
−971 kJ·mol−1[2]
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Related compounds
Other anions
 manganese trifluoride, manganese(III) acetate
Other cations
 chromium(III) oxide, iron(III) oxide
Related compounds
 manganese(II) oxide, manganese dioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Manganese(III) oxide is a chemical compound with the formula Mn2O3. It occurs in nature as the mineral bixbyite (recently changed to bixbyite-(Mn)[3][4]) and is used in the production of ferrites and thermistors.

  1. ^ Chandiran, Kalaiselvi; Murugesan, Ramesh Aravind; Balaji, Revathi; Andrews, Nirmala Grace; Pitchaimuthu, Sudhagar; Nagamuthu Raja, Krishna Chandar (2020-07-03). "Long single crystalline α-Mn2O3 nanorods: facile synthesis and photocatalytic application". Materials Research Express. 7 (7). IOP Publishing: 074001. doi:10.1088/2053-1591/ab9fbd. ISSN 2053-1591. S2CID 225561660.
  2. ^ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
  3. ^ "Bixbyite-(Mn)".
  4. ^ IMA 21-H: Redefinition of bixbyite and definition of bixbyite-(Fe) and bixbyite-(Mn). CNMNC Newsletter, 64, 2021; Mineralogical Magazine, 85, 2021).