Thallium(III) oxide

Thallium(III) oxide

Names
Other names thallium trioxide, thallium sesquioxide
Identifiers
CAS Number	1314-32-5 Y
3D model (Jmol)	Interactive image
ChemSpider	7979876 Y
ECHA InfoCard	100.013.846
EC Number	215-229-3
PubChem	9804116
InChI InChI=1S/3O.2Tl/q3*-2;2*+3 Y Key: LPHBARMWKLYWRA-UHFFFAOYSA-N Y
SMILES [O-2].[O-2].[O-2].[Tl+3].[Tl+3]
Properties
Chemical formula	Tl2O3
Molar mass	456.76 g/mol
Appearance	very dark, nearly black solid
Density	10.19 g/cm3, solid (22 °C)
Melting point	717 °C (1,323 °F; 990 K)
Boiling point	875 °C (1,607 °F; 1,148 K) (decomposes)
Solubility in water	insoluble
Magnetic susceptibility (χ)	+76.0·10−6 cm3/mol
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206
Hazards
EU classification (DSD)	not listed
NFPA 704	0 4 0
Lethal dose or concentration (LD, LC):
LD50 (median dose)	44 mg/kg (oral, rat)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Thallium(III) oxide is a chemical compound of thallium and oxygen. It occurs in nature as the rare mineral avicennite. Its structure is related to that of Mn₂O₃ which has a bixbyite like structure. Tl₂O₃ is metallic with high conductivity and is a degenerate n-type semiconductor which may have potential use in solar cells. A method of producing Tl₂O₃ by MOCVD is known. Any practical use of thallium(III) oxide will always have to take account of thallium's poisonous nature. Contact with moisture and acids may form poisonous thallium compounds.

It is produced by the reaction of thallium with oxygen or hydrogen peroxide in an alkaline thallium(I) solution. Alternatively, it can be created by the oxidation of thallium(III) nitrate by chlorine in an aqueous potassium hydroxide solution.