2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146966We derive and discuss expressions for the temperature-dependent electrostatic polarizabilities of off-center ions holding good under various experimental conditions. At low temperatures and electric-field strengths, all of them reasonably reduce to values characteristic of phonon-coupled two-level systems. Prospects for further studies of the dispersive coupling are also considered.6 pages including 1 figure, all pdf formatMaterials ScienceOther Condensed Mattertext