title: Vanadium oxide
text: # Vanadium oxide
  
  Vanadium oxide may refer to:
  
  * Vanadium(II) oxide (vanadium monoxide), VO
  * Vanadium(III) oxide (vanadium sesquioxide or trioxide), $V_2O_3$
  * Vanadium(IV) oxide (vanadium dioxide), $VO_2$
  * Vanadium(V) oxide (vanadium pentoxide), $V_2O_5$
  
  In addition to these principal oxides of vanadium, various other distinct phases exist:
  
  * Phases with the general formula $V_nO_{2n+1}$ exist between $V_2O_5$ and $VO_2.$ Examples of these phases include $V_3O_7,$ $V_4O_9$ and $V_6O_{13}.$
  * Phases with the general formula $V_nO_{2n−1}$ exist between $VO_2$ and $V_2O_3.$ Called Magnéli phases for Arne Magnéli, they are examples of crystallographic shear compounds based on the rutile structure. Examples of Magnéli phases include $V_4O_7,$ $V_5O_9,$ $V_6O_{11},$ $V_7O_{13}$ and $V_8O_{15}.$
  * $V_3O_5$ appears as the mineral oxyvanite.
  
  Many vanadium-oxygen phases are non-stoichiometric.
  
  