New insights from Raman and IR spectroscopy into the metal-insulator transition of YHx switchable mirrors

Polarization‐dependent Raman spectroscopy of LiBH4 single crystals and Mg(BH4)2 powders

“…Although earlier investigations have concentrated very much on the metal-insulator transition of rather simple metal hydrides such as the prototype materials REH x (RE = Y or rare-earth element, 0 ≤ x ≤ 3), [1 -3] present research efforts focus on complex hydrides containing only light elements of the periodic table. [4 -6] Among these, LiBH 4 and Mg(BH 4 ) 2 possess, with 18.5 and 14.9 mass%, respectively, some of the largest theoretical hydrogen storage capacities, compared to only 2.5 mass% hydrogen in YH 3 . The complexity of these light-weight hydrides, the availability only in the powder form and the reactivity under ambient conditions have limited the basic investigations on these compounds.…”