Rhodium(IV) oxide

(Redirected from Rhodium dioxide)

Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula RhO2.

Rhodium(IV) oxide
Rhodium(IV) oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.021 Edit this at Wikidata
EC Number
  • 235-237-0
  • InChI=1S/2O.Rh/q2*-2;+4 checkY
    Key: ZLDSZHMBHVKLCB-UHFFFAOYSA-N checkY
  • InChI=1/2O.Rh/q2*-2;+4
    Key: ZLDSZHMBHVKLCB-UHFFFAOYAD
  • [Rh+4].[O-2].[O-2]
Properties
RhO2
Molar mass 134.904 g/mol
Appearance black crystalline solid
Density 7.2 g/cm3
Melting point 1,050 °C (1,920 °F; 1,320 K) (decomposes)
Solubility insoluble in aqua regia
Structure
tetragonal (rutile)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical properties

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RhO2 is highly insoluble even in hot aqua regia.[1]

Structure

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RhO2 has the tetragonal rutile structure.[2]

Physical properties

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RhO2 has metallic resistivity with values <10−4 Ohm·cm. It transforms in air to Rh2O3 at 850 °C and then to metal and oxygen at 1050 °C.[2]

See also

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References

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  1. ^ O. Muller and R. Roy (1968). "Formation and stability of the platinum and rhodium oxides at high oxygen pressures and the structures of Pt3O4, β-PtO2 and RhO2". Journal of the Less Common Metals. 16 (2): 129–146. doi:10.1016/0022-5088(68)90070-2.
  2. ^ a b R. D. Shannon (1968). "Synthesis and properties of two new members of the rutile family RhO2 and PtO2". Solid State Communications. 6 (3): 139–143. Bibcode:1968SSCom...6..139S. doi:10.1016/0038-1098(68)90019-7.