Vanadium oxide
# 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.

