Pure samples of monohydrated and non-hydrated material were synthesized. Pulsed nuclear magnetic resonance data for all of the materials, over a wide temperature range, were explained in terms of structural features and proton motion. Two types of water molecule reorientation were observed in the monohydrate, and were characterized in terms of activation energies and correlation times. These were 2.2 x 10-15s and 29kJ/mol or 4 x 10-13s and 31.2kJ/mol.

M.T.Weller, P.G.Dickens: Journal of Solid State Chemistry, 1988, 75[1], 141-6