Medium and long range correlations in the electrolyte LiCl·4H2O: Transition to the glass regime

Prével, B.; Jal, J. F.; Dupuy-Philon, J.; Soper, A. K.
August 1995
Journal of Chemical Physics;8/1/1995, Vol. 103 Issue 5, p1897
Academic Journal
New data on the structure of water in the aqueous system LiCl·RH2O, with R=4, are presented for the liquid, supercooled liquid, and glass states. The results are compared to an earlier study of the system LiCl·6H2O [J. Chem. Phys. 103, 1886 (1995)]. Many of the qualitative trends seen for R=6 are similar for R=4, but there is evidence that the water structure is even more severely disrupted than for R=6. In the liquid state the distribution functions appear to be dominated by the packing of hydrated ions, rather than by hydrogen bonding forces. The latter partly reassert themselves in the supercooled and glass states. H/D isotope substitution throws some light on the first structure diffraction peak (FSDP) at 0.5 Å-1 which is correlated with the nonhydrogenated components. This peak is not therefore the signature of long range water concentration fluctuations, but must be due to some weak periodicity in the underlying longer range order. © 1995 American Institute of Physics.


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