Reaction between iron oxides to form magnetite

In the notes of a course it is indicated that the reaction of formation of magnetite from iron oxides can only take place if the partial pressure of oxygen is higher than 1 nanobar.


$\ce{FeO}$ + $\ce{Fe2O3}$ $\rightarrow$ $\ce{Fe3O4}$


I have tried to search in the scientific literature for the origin of this fact, but I have not found anything. I assume it will be a kinetic limitation, since the reaction is thermodynamically favored at any temperature. Am I correct?


