Thallium(III) oxide

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Thallium(III) oxide
Thallium(III) oxide
Other names
thallium trioxide, thallium sesquioxide
1314-32-5 YesY
ChemSpider 7979876 YesY
EC Number 215-229-3
Jmol 3D model Interactive image
PubChem 9804116
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)
Cubic, cI80[2]
Ia-3, No. 206
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
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.


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.[citation needed]


  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. 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.