A thermodynamic model of the electric phase transitions of the first- and second-order, like a model of magnetic phase transitions for nanostructures, e.g., for metallic nanostructured europium, is con- sidered. It was shown that, for structures possessing first-order electric phase transitions, the formation of nanostructures with 30- to 50-nm crystallites is necessary. A decrease in nanocrystallite size in a nanostruc- ture leads to a lowering of the transition intensity and to a decrease in the transition temperature. The results of this model correspond to the experimental data for the electric transitions and to the size factors that impact them in V_2O_3, VO_2, and Fe_3O_4.
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