2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161962It is shown that a sufficiently strong external electric field causes a decrease in the transition temperature of ferroelectric, antiferroelectric, and metal-insulator transitions. The temperature dependence of the critical electric field suppressing a low-temperature phase is obtained. The relation between the low-temperature charge gap (the band gap) in the insulating phase and the metal-insulator transition temperature is also inferred.REVTeX, 9 pages, minor changesStatistical Mechanicstext