Thallium(III) oxide

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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
Properties[1]
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)
insoluble
+76.0·10−6 cm3/mol
Structure
Cubic, cI80[2]
Ia-3, No. 206
Hazards
not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
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).
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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.

Production[edit]

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.[citation needed]

References[edit]

  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 & M. Fatemi (1991). "Thallium(III) Oxide by Organometallic Chemical Vapor Deposition". Chemistry of Materials. 3 (1): 72–77. doi:10.1021/cm00013a019.