it was shown that WOx can be obtained in a range of crystal phases and that its phase transitions are rather complex. Reports indicate that by nanostructuring WOx, the energy required to transform the phases was considerably less than that of the bulk material, and that uniquely the orthorhombic phase can be retained at room temperature. This is a very important property of nanostructured WOx, as in addition to amorphous, triclinic, monoclinic and hexagonal phases, which are stable at room temperature, the orthorhombic phase can also be evaluated as a possible candidate for the inclusion in practical devices