2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/25772We show that a ferroelectric phase transition takes place in the incommensurate phase of the K2SeO4 crystal. The ferroelectric character of the IC phase explains the second-harmonic generation observed in the corresponding temperature range.5 pages, 1 figureMaterials Sciencetext