Manganese(III) oxide
Chemical compound / From Wikipedia, the free encyclopedia
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.
Quick Facts Names, Identifiers ...
Names | |
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Other names
dimanganese trioxide, manganese sesquioxide, manganic oxide, manganous oxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.013.878 |
PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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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 | |
Std molar entropy (S⦵298) |
110 J·mol−1·K−1[2] |
Std enthalpy of formation (ΔfH⦵298) |
−971 kJ·mol−1[2] |
Hazards | |
NFPA 704 (fire diamond) | |
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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