Antimony trioxide

Antimony(III) oxide
Names
	IUPAC name Antimony(III) oxide
	Other names Antimony sesquioxide; Antimonous oxide; Flowers of Antimony
Identifiers
CAS Number	1309-64-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	25727 ;
ECHA InfoCard	100.013.796
EC Number	215-474-6;
KEGG	C19192 ;
PubChem CID	14794;
RTECS number	CC5650000;
UNII	P217481X5E ;
CompTox Dashboard (EPA)	DTXSID4023880 ;
	InChI InChI=1S/3O.2Sb Key: ADCOVFLJGNWWNZ-UHFFFAOYSA-N ; InChI=1/3O.2Sb/rO3Sb2/c1-4-3-5-2 Key: ADCOVFLJGNWWNZ-VTKDZCJOAA;
	SMILES O=[Sb]O[Sb]=O;
Properties
Chemical formula	Sb2O3
Molar mass	291.518 g/mol
Appearance	white solid
Odor	odorless
Density	5.2 g/cm3, α-form ; 5.67 g/cm3 β-form
Melting point	656 °C (1,213 °F; 929 K)
Boiling point	1,425 °C (2,597 °F; 1,698 K) (sublimes)
Solubility in water	370±37 µg/L between 20.8 °C and 22.9 °C
Solubility	soluble in acid
Magnetic susceptibility (χ)	−69.4×10−6 cm3/mol
Refractive index (nD)	2.087, α-form ; 2.35, β-form
Structure
Crystal structure	cubic (α) < 570 °C; orthorhombic (β) > 570 °C
Coordination geometry	pyramidal
Dipole moment	zero
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H351
Precautionary statements	P281
NFPA 704 (fire diamond)	2 0 0
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	7000 mg/kg, oral (rat)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.5 mg/m3 (as Sb)
REL (Recommended)	TWA 0.5 mg/m3 (as Sb)
Related compounds
Other anions	Antimony trisulfide; Antimony triselenide; Antimony telluride
Other cations	Dinitrogen trioxide; Phosphorus trioxide; Arsenic trioxide; Bismuth trioxide
Related compounds	Diantimony tetraoxide; Antimony pentoxide
Supplementary data page
	Antimony trioxide (data page)
	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

Antimony(III) oxide is the inorganic compound with the formula Sb₂O₃. It is the most important commercial compound of antimony. It is found in nature as the minerals valentinite and senarmontite. Like most polymeric oxides, Sb₂O₃ dissolves in aqueous solutions with hydrolysis. A mixed arsenic-antimony oxide occurs in nature as the very rare mineral stibioclaudetite.

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