Rhodium(IV) oxide

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Rhodium(IV) oxide
Rhodium(IV) oxide
Identifiers
CAS number 12137-27-8 YesY
PubChem 82936
ChemSpider 15017693 YesY
EC number 235-237-0
Jmol-3D images Image 1
Properties
Molecular formula RhO2
Molar mass 134.904 g/mol
Appearance black crystalline solid
Density 7.2 g/cm³
Melting point 1050 °C (decomposes)
Solubility insoluble in aqua regia
Structure
Crystal structure tetragonal (rutile)
Hazards
EU classification not listed
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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

Chemical properties[edit]

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

Structure[edit]

RhO2 has the tetragonal rutile structure.[2]

Physical properties[edit]

RhO2 has metallic resistivity with values <10−4 Ohm·cm. It transforms in air to RhO3 at 850 °C and then to metal and oxygen at 1050 °C.[2]

See also[edit]

References[edit]

  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: 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: 139–143. doi:10.1016/0038-1098(68)90019-7.