Lightweight hydrogen-storage material Mg0.65Sc0.35D2 studied with 2H and 2H-{45Sc} MAS NMR exchange spectroscopy

► Magnesium scandium deuteride investigated with 2H MAS NMR. ▶ Distinct deuterium sites from 2H-45Sc correlation NMR. ▶ Deuterium exchange between sites from Exsy. ▶ MAS-rate and temperature dependence in Exsy indicative of combined chemical and spin exchange.