Nonstoichiometry and problems of exclusion of polymorph transitions in crystalline compounds

The influence of imperfections in the crystal lattice of tungsten trioxide, caused by the violation of its stoichiometry, on polymorphic transitions arising with a change in temperature is considered. It is shown that the introduction of a more electropositive metal into tungsten trioxide, which converts this oxide into oxide-tungsten bronze, leads to the suppression of the phenomena of oxygen nonstoichiometry, which creates conditions for the stabilization of polymorphic modifications in a wide temperature range. Tab. 1, ill. 4, bibliography: 16 titles.