![]() ![]() Spedding, F.H., Rulf, D.C., Gerstein, B.C.: Thermal study of entropies and crystal field splittings in heavy rare earth trichloride hexahydrates. Rard, 31 August 1976 (available in electronic supplementary material) Schumm, R.H.: Personal communication to J. Höhere Grundtermkomponenten von Ho-, Er- und Nd-Chlorid. Pfeffer, W.: Spezifische Wärme von LuCl 3♶H 2O zwischen 1,4 °K und 220 °K. Pfeffer, W.: Spezifische Wärmen von D圜l 3♶H 2O und NdCl 3♶H 2O im Temperaturbereich zwischen 1,2 °K und 220 °K. Pfeffer, W.: Spezifische Wärmen von HoCl 3♶H 2O und ErCl 3♶H 2O im Temperaturbereich zwischen 1,2 °K und 230 °K. ![]() Hellwege, K.H., Küch, F., Niemann, K., Pfeffer, W.: Spezifische Wärmen von GdCl 3♶H 2O im Temperaturbereich zwischen 1,1 °K und 260 °K. nH 2O im Temperaturbereich zwischen 4,8 °K und 260 °K.Hellwege, K.H., Johnsen, U., Pfeffer, W.: Spezifische Wärmen von PrCl 3 Spedding, F.H., Rard, J.A., Habenschuss, A.: Standard state entropies of the aqueous rare earth ions. Hinchey, R.J., Cobble, J.W.: Standard-state entropies for the aqueous trivalent lanthanide and yttrium ions. 8, 613–617 (1969)Ĭoulter, L.V., Latimer, W.M.: The heat of solution of gadolinium sulfate octahydrate and the entropy of gadolinium ion. In addition, standard molar heat capacities of most of the RE 3+(aq) were evaluated from published results for dilute solutions from flow microcalorimetry.īertha, S.L., Choppin, G.R.: Hydration thermodynamics of the lanthanide ions. By combining these results with critically-assessed standard molar enthalpies of formation of the RE 3+(aq), the standard molar Gibbs energies of formation of these trivalent rare earth aquo ions were calculated, as were the corresponding standard molar Gibbs energies and enthalpies of formation of the thermodynamically stable RECl 3♷H 2O(cr) and RECl 3♶H 2O(cr) phases at T = 298.15 K and p = 0.1 MPa. By using these entropies, standard molar enthalpies of solution and revised results for the standard molar Gibbs energy changes to form the saturated solutions, revised and CODATA-compatible values of the standard molar entropies of the RE 3+(aq), \( S_) \) where RE = (La, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y), were evaluated or estimated (RE = Pm). Simple methods are described to correct these entropies of the RECl 3♷H 2O(cr) and RECl 3♶H 2O(cr) and to estimate the standard molar entropies of the RECl 3♶H 2O(cr) from those of the corresponding anhydrous RECl 3(cr). However, the entropies of these RECl 3♷H 2O(cr) and of several of the RECl 3♶H 2O(cr) have large uncertainties because the source heat capacities only extend up to T = 223–262 K and not to T = 298.15 K and the crystals used for these measurements contained some occluded solution (water excess). 81: 1069–1074, 1977) the standard molar entropies of the aqueous trivalent rare earth ions RE 3+(aq) were calculated based on the standard molar entropies of the hydrated rare earth chlorides RECl 3♷H 2O(cr) (RE = La, Pr) and RECl 3♶H 2O(cr) (RE = Nd, Gd, Tb, Dy, Ho, Er, Lu) at T = 298.15 K and p = 0.1 MPa, along with their corresponding standard molar enthalpies and Gibbs energies of solution, which are known for nearly all of the RECl 3♷H 2O(cr) and RECl 3♶H 2O(cr) including YCl 3♶H 2O(cr). ![]()
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