Rhodium(IV) oxide

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Rhodium(IV) oxide
Rhodium(IV) oxide
Identifiers
CAS number 12137-27-8 N
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 1,050 °C (1,920 °F; 1,320 K) (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.