Thallium(III) oxide

Thallium(III) oxide
Other names thallium trioxide, thallium sesquioxide
Identifiers
CAS number	1314-32-5
ChemSpider	7979876 Y
EC number	215-229-3
InChI InChI=1S/3O.2Tl/q3*-2;2*+3 Y Key: LPHBARMWKLYWRA-UHFFFAOYSA-N Y
Properties[1]
Molecular formula	Tl2O3
Molar mass	456.76 g/mol
Appearance	colourless solid
Density	10.19 g/cm3, solid (22 °C)
Melting point	717 °C (1323 °F)
Boiling point	875 °C decomp.
Solubility in water	insoluble
Structure
Crystal structure	Cubic, cI80[2]
Space group	Ia-3, No. 206
Hazards
EU classification	not listed
NFPA 704	0 4 0
LD50	44 mg/kg
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Thallium(III) oxide is a chemical compound of thallium and oxygen. It occurs in nature as the rare mineral avicennite.^[3] 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.^[4] A method of producing Tl₂O₃ by MOCVD is known.^[5] 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.

References

1. ^ Weast, Robert C., ed (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. B156. ISBN 0-8493-0462-8. .
2. ^ Otto H.H., Baltrasch R., Brandt H.J. (1993). "Further evidence for Tl3+ in Tl-based superconductors from improved bond strength parameters involving new structural data of cubic Tl2O3". Physica C 215 (1-2): 205. doi:10.1016/0921-4534(93)90382-Z. 
3. ^ http://www.handbookofmineralogy.org/pdfs/avicennite.pdf Handbook of Mineralogy
4. ^ Phillips R. J., Shane M. J., Switzer J. A. (1989). "Electrochemical and photoelectrochemical deposition of Thallium(III) Oxide thin films". Journal of Materials Research 4 (04): 923. doi:10.1557/JMR.1989.0923. 
5. ^ D. Berry, R. T. Holm, R. L. Mowery, N. H. Turner, and M. Fatemi (1991). "Thallium(III) Oxide by Organometallic Chemical Vapor Deposition". Chemistry of Materials 3 (1): 72–77. doi:10.1021/cm00013a019.