2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19869Electric polarization phenomena in insulating systems have long been described in mean field theory by the (static) Clausius-Mossotti or (dynamic) Lorentz-Lorenz polarizabilities. It is here shown, in the strong coupling regime, that a thermodynamic phase instability exists in these models. The resulting thermodynamic phase diagram coincides with that obtained from Dicke-Preparata model of thermal superradiance.6 pages LaTeX and 1 figure *.epsStatistical Mechanicstext