Abstract
High-pressure Raman spectroscopic investigations are carried out on Li 2SO 4·H 2O up to a pressure of 18.1 GPa. Changes in the Raman spectra suggest two structural transitions occurring around 2.6 and 7.0 GPa, respectively. Discontinuous changes in the internal mode frequencies of sulfate ions around 2.6 GPa indicate that the transition involves reorientation of SO 4 ions. A comparison of the behavior of the high-pressure phase in this compound with those in other Li-based binary sulfates indicates that the orientational disorder in these compounds at high pressures arises due to dissimilar cations.
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