Standard state entropies of the aqueous rare earth ions
Recently data have become available for the activity coefficients of 14 rare earth chlorides, and for the heats of dilution of 13 rare earths chlorides, from dilute solution to saturation at 25/sup 0/C. In addition, new heats of solution data have been reported for the hydrated crystals of 13 of the rare earth chlorides. These data have been used here, together with crystal entropy data, to calculate standard state ionic entropies for the rare earth ions in aqueous solution. The standard state ionic entropies form two series when plotted against the inverse square of the ionic radius of the rare earth ion. The S shape of this series curve was found to be consistent with a decrease in the rare earth ion's inner-sphere hydration number between Nd and Tb, and with an increase in total ionic hydration from La to Lu.
- Research Organization:
- Ames Lab., IA
- OSTI ID:
- 7305523
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 81:11; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CALCULATION METHODS
CATIONS
CHARGED PARTICLES
DISPERSIONS
ENTROPY
HYDRATION
IONS
MIXTURES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SOLUTIONS
SOLVATION
THERMODYNAMIC PROPERTIES