2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102830We review some results on the role played by dielectric polarons at the metal-insulator transition in polarizable materials, taking into account the long-range nature of the Coulomb interactions. The occurrence of a polarization catastrophe is examined in a model describing a Wigner crystal of polarons. The possible relevance of this scenario in the cuprates and in metal-ammonia solutions is discussed.Proceedings of the International School of Physics "Enrico Fermi", Course CLXI -"Polarons in Bulk Materials and Systems with Reduced Dimensionality"SuperconductivityStrongly Correlated Electronstext