Manganese(III) oxide

Manganese(III) oxide
Names
	Other names dimanganese trioxide, manganese sesquioxide, manganic oxide, manganous oxide
Identifiers
CAS Number	1317-34-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	14139 ;
ECHA InfoCard	100.013.878
PubChem CID	14824;
RTECS number	OP915000;
UNII	XQ8YIG4A7C ;
CompTox Dashboard (EPA)	DTXSID90893847 ;
	InChI InChI=1S/2Mn.3O Key: GEYXPJBPASPPLI-UHFFFAOYSA-N ; InChI=1/2Mn.3O/rMn2O3/c3-1-5-2-4 Key: GEYXPJBPASPPLI-YNHMASKPAU;
	SMILES O=[Mn]O[Mn]=O;
Properties
Chemical formula	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)
Solubility in water	0.00504 g/100 mL (alpha form) ; 0.01065 g/100 mL (beta form)
Solubility	insoluble in ethanol, acetone ; soluble in acid, ammonium chloride
Magnetic susceptibility (χ)	+14,100·10−6 cm3/mol
Structure
Crystal structure	Bixbyite, cI80
Space group	Ia3 (No. 206)
Lattice constant	a = 942 pm
Thermochemistry
Std molar; entropy (S⦵298)	110 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−971 kJ·mol−1
Hazards
NFPA 704 (fire diamond)	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). verify (what is ?) Infobox references

Manganese(III) oxide is a chemical compound with the formula Mn₂O₃. It occurs in nature as the mineral bixbyite (recently changed to bixbyite-(Mn)) and is used in the production of ferrites and thermistors.