X-RAY-DIFFRACTION STUDY ON AQUEOUS LITHIUM-CHLORIDE SOLUTION IN THE TEMPERATURE-RANGE 138-373-K

X-ray scattering measurements on an aqueous solution of LiCl with mola r ratio [H2O]/[LiCI] = 5 have been performed in the temperature range 138-373 K. Our attention is focused on the effect of temperature on mi croscopic structures of hydrated Li+ and Cl- from the high-temperature liquid state to the glassy state. It is shown that with lowering temp erature the water-water correlation within the hydration shell of Lidecreases, while the hydration shell of Cl- is more structured in the supercooled and glassy states. This structural change with temperature is discussed together with previously reported Raman and neutron inel astic scattering results on the basis of hydrogen bonds related to ion -water and water-water interactions.