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.^[3] 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.^[4]^[5]

^ ^a ^b ^c ^d Record of Antimony trioxide in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 23 August 2017.
^ ^a ^b NIOSH Pocket Guide to Chemical Hazards. "#0036". National Institute for Occupational Safety and Health (NIOSH).
^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
^ "Stibioclaudetite".
^ "List of Minerals". 21 March 2011.

[GESTIS-1] Record of Antimony trioxide in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 23 August 2017.

[PGCH-2] NIOSH Pocket Guide to Chemical Hazards. "#0036". National Institute for Occupational Safety and Health (NIOSH).

[3] Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.

[4] "Stibioclaudetite".

[5] "List of Minerals". 21 March 2011.

[1]

[2]

[3]

[4]

[5]

Names

IUPAC name Antimony(III) oxide
Other names Antimony sesquioxide Antimonous oxide Flowers of Antimony
Identifiers
CAS Number	1309-64-4^Y
3D model (JSmol)	Interactive image
ChemSpider	25727^Y
ECHA InfoCard	100.013.796
EC Number	215-474-6
KEGG	C19192^Y
PubChem CID	14794
RTECS number	CC5650000
UNII	P217481X5E^Y
CompTox Dashboard (EPA)	DTXSID4023880
InChI InChI=1S/3O.2Sb^Y Key: ADCOVFLJGNWWNZ-UHFFFAOYSA-N^Y 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 (n_D)	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	^[1]
Signal word	Warning^[1]
Hazard statements	H351^[1]
Precautionary statements	P281^[1]
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)^[2]
REL (Recommended)	TWA 0.5 mg/m³ (as Sb)^[2]
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). Y verify (what is ^YN ?) Infobox references