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Raman spectroscopy and dielectric measurements of betaine rubidium iodide dihydrate

Dielectric measurements and Raman spectroscopy have shown for betaine rubidium iodide dihydrate, with formula [(CH3)3N+CH2COO-]2RbI·2H2O, BRbI for short, the existence of two phase transitions in this compound, PT1 (at Tc1 = 190 K) and PT2 (at Tc2 = 90 K). The former phase transition is related to the loss of translational and librational degrees of freedom of water molecules and this, as shown by dielectric data, triggers a relaxation process leading to a complete `freezing in' of protons within the unit cell, and therefore, producing a proton-glass state.