| Identification | More | [Name]
MANGANESE (III) OXIDE | [CAS]
1317-34-6 | [Synonyms]
MANGANESE (III) OXIDE
MANGANESE OXIDE
MANGANESE SESQUIOXIDE
dimanganesetrioxide
manganese(3+)oxide
manganesemanganate
manganeseoxide(mn2o3)
manganesesisquioxide
manganesetrioxide
manganicoxide
Manganese(III) oxide, 99.999% metals basis
MANGANESE(III) OXIDE,-325 MESH, 99%
MANGANESE (III) OXIDE, MN>70+% 300 MESH (POWDER 99%)
MANGANESE (III) OXIDE, 99.9%
Manganese(III)oxide,99% | [EINECS(EC#)]
215-264-4 | [Molecular Formula]
Mn2O3 | [MDL Number]
MFCD00016217 | [Molecular Weight]
157.87 | [MOL File]
1317-34-6.mol |
| Chemical Properties | Back Directory | [Definition]
In nature as manganite,
a manganese ore. | [Appearance]
Black, lustrous powder, sometimes
tinged brown. Very hard.decomposes at
1080C. Soluble in cold hydrochloric acid; not soluble in nitric acid (decomposes), hot sulfuric acid;
insoluble in water. Noncombustible. | [Melting point ]
1080°C (dec.) | [density ]
4.5 g/mL at 25 °C(lit.)
| [solubility ]
insoluble in H2O | [form ]
Powder | [color ]
Black | [Specific Gravity]
4.5 | [Water Solubility ]
Soluble in acid and ammonium chloride. Insoluble in water, alcohol and acetone. | [Merck ]
14,5737 | [Exposure limits]
ACGIH: TWA 0.02 mg/m3; TWA 0.1 mg/m3
OSHA: Ceiling 5 mg/m3
NIOSH: IDLH 500 mg/m3; TWA 1 mg/m3; STEL 3 mg/m3 | [InChIKey]
GEYXPJBPASPPLI-UHFFFAOYSA-N | [CAS DataBase Reference]
1317-34-6(CAS DataBase Reference) | [EPA Substance Registry System]
Manganese(III) oxide (1317-34-6) |
| Safety Data | Back Directory | [Hazard Codes ]
Xi | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing . | [WGK Germany ]
3
| [RTECS ]
OP0915000
| [TSCA ]
Yes | [Safety Profile]
Moderately toxic by
subcutaneous and intratracheal routes. See
also MANGANESE COMPOUNDS. | [Toxicity]
mouse,LD50,subcutaneous,616mg/kg (616mg/kg),Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva im. D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. Vol. 19, Pg. 186, 1974. |
| Hazard Information | Back Directory | [Hazard]
Flammable in finely divided form. Toxic by
inhalation of dust. | [Chemical Properties]
manganese(III) oxide is a black, lustrous powder, sometimes tinged brown. Very hard.decomposes at 1080℃. Soluble in cold hydrochloric acid; not soluble in nitric acid (decomposes), hot sulfuric acid; insoluble in water. Noncombustible.
manganese(III) oxide is obtained by igniting manganese(IV) oxide or a manganese(II) salt in air at 800°C. It reacts slowly with cold dilute acids to form manganese(III) salts. Manganese(III) oxide occurs in nature as braunite (3Mn2O3.MnSiO3 ) and the monohydrate (Mn2O 3.H2O) occurs in the mineral manganite. The manganese(III) oxide crystal lattice contains Mn3+ and O2– ions. With concentrated alkalis, it undergoes disproportionation to give manganese(II) and manganese(IV) ions.
| [Uses]
Manganese(III) oxide is used to produce ceramic magnets and semiconductors. Further, it serves as a precursor to lithium manganese oxide. In addition to this, it acts as a useful battery cathode. | [Preparation]
Anhydrous manganese(III) oxide is found as the mineral braunite, Mn2O3, while a hydrated form, Mn2O3.H2O, which is chemically more reactive, occurs as manganite. Manganese forms both anions and cations in oxidation state +3. Simple salts of tervalent manganese are not stable. However, complexes are more stable, the hexacyanomanganates(III) being an example: K3Mn(CN)6 is a red crystalline solid, isomorphous with potassium hexacyanoferrate(III) and slowly hydrolysed.
Manganese(III) oxide is formed as a grey solid by heating manganese(IV) oxide to 700°C for several hours:
4MnO2 ---> 2Mn203 + O2
It is converted into trimanganese tetroxide when heated above 940°C in air or reduced by hydrogen above 230°C. Hot concentrated hydrochloric acid is oxidized to chlorine by manganese(III) oxide:
Mn203 (s) + 6H + + 2e- ==2Mn2+ + 3H2O
Mn203 (s) + 6H + + 2Cl- ---> 2Mn2+ + 3H2O + Cl2 | [Flammability and Explosibility]
Notclassified |
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