Rhodium(IV) oxide
Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula RhO2.
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.032.021 |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| 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) | |
| Hazards | |
EU classification (DSD) (outdated) |
not listed |
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
RhO2 is highly insoluble even in hot aqua regia.[1]
Structure
RhO2 has the tetragonal rutile structure.[2]
Physical properties
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
References
- 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.
- 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.
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