Abstract
In order to show the contact point of diffraction studies and thermodynamics, structure description by “mixing state” for solutions is presented. The concentration fluctuation and the Kirkwood-Buff parameters are the ones to investigate the mixing state of solutions quantitatively. These parameters are obtained by small-angle X-ray scattering and themodynamic experiments, respectively. As examples of the analysis of the mixing state, the small-angle X-ray scattering studies for ethyl alcohol-water, iso-propyl alcohol-water, n-propyl alcohol-water, and tert-butyl alcohol-water systems and thermodynamic studies of 2-butoxyethanol-water system are presented.
