Rhodium dioxide

Rhodium(IV) oxide

Identifiers
CAS Number	12137-27-8 N
3D model (Jmol)	Interactive image
ChemSpider	15017693 Y
ECHA InfoCard	100.032.021
EC Number	235-237-0
PubChem CID	82936
InChI InChI=1S/2O.Rh/q2*-2;+4 Y Key: ZLDSZHMBHVKLCB-UHFFFAOYSA-N Y InChI=1/2O.Rh/q2*-2;+4 Key: ZLDSZHMBHVKLCB-UHFFFAOYAD
SMILES [Rh+4].[O-2].[O-2]
Properties
Chemical 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EU classification (DSD) (outdated)	not listed
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

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

RhO₂ is highly insoluble even in hot aqua regia.

RhO₂ has the tetragonal rutile structure.

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.