A new equation is developed for the molar volume of ions in aqueous solution which covers all types of ions to temperatures up to 200°C. The local compressibility of the water surrounding the ions is assumed to decrease with increased polarization, so that the inner water layers of polyvalent ions contribute little to the electrostriction effect. Large anions show an abnormal increase in their intrinsic ionic volumes at higher temperatures.
E. Glueckauf, Trans. Faraday Soc., 1968, 64, 2423 DOI: 10.1039/TF9686402423
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