Thallium(III) oxide

Thallium(III) oxide, also known as thallic oxide, is a chemical compound of thallium and oxygen. It occurs in nature as the rare mineral avicennite.[4] 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.[5] A method of producing Tl2O3 by MOCVD is known.[6] 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.

Thallium(III) oxide
Thallium(III) oxide
Names
Other names
thallium trioxide, thallium sesquioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.846
EC Number
  • 215-229-3
UNII
  • InChI=1S/3O.2Tl/q3*-2;2*+3 checkY
    Key: LPHBARMWKLYWRA-UHFFFAOYSA-N checkY
  • [O-2].[O-2].[O-2].[Tl+3].[Tl+3]
Properties[1]
Tl2O3
Molar mass 456.76 g/mol
Appearance dark brown 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)
insoluble
+76.0·10−6 cm3/mol
Structure
Cubic, (Bixbyite) cI80[2]
Ia3 (No. 206)
Hazards
GHS labelling:[3]
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H300+H330, H373, H411
P273, P301+P310+P330, P304+P340+P310, P314
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
4
0
0
Lethal dose or concentration (LD, LC):
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 verify (what is checkY☒N ?)
Infobox references

Production

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(I) nitrate by chlorine in an aqueous potassium hydroxide solution.[7]

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. GHS: Sigma-Aldrich 204617
  4. http://www.handbookofmineralogy.org/pdfs/avicennite.pdf Handbook of Mineralogy
  5. 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 (4): 923. doi:10.1557/JMR.1989.0923.
  6. D. Berry; R. T. Holm; R. L. Mowery; N. H. Turner & M. Fatemi (1991). "Thallium(III) Oxide by Organometallic Chemical Vapor Deposition". Chemistry of Materials. 3 (1): 72–77. doi:10.1021/cm00013a019.
  7. Georg Brauer; Handbuch der präparativen anorganischen Chemie, Band 2, S.884; ISBN 3-432-87813-3 (in German)


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