title: Rhodium(IV) oxide
text: # Rhodium(IV) oxide
  
  Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula $RhO_2.$
  
  ## Chemical properties
  
  $RhO_2$ is highly insoluble even in hot aqua regia.
  
  ## Structure
  
  $RhO_2$ has the tetragonal rutile structure.
  
  ## Physical properties
  
  $RhO_2$ has metallic resistivity with values $<10^{−4}$ Ohm·cm. It transforms in air to $Rh_2O_3$ at 850 °C and then to metal and oxygen at 1050 °C.
  
  