IUPAC-NIST Solubility Data Series. 87. Rare Earth Metal Chlorides in Water and Aqueous Systems. Part 3. Heavy Lanthanides (Gd–Lu)

Abstract

This is the third and last part of the volume devoted to solubility data of rare earth metal chlorides in water and in ternary and quaternary aqueous systems. Compilations of all available experimental data for each rare earth metal chloride are introduced with a corresponding critical evaluation. Every such evaluation contains a tabulated collection of all solubility results in water, a scheme of the water-rich part of the equilibrium LnCl3–H2O phase diagram, solubility equation(s), a selection of suggested solubility data, and a brief discussion of the multicomponent systems. Because the ternary and quaternary systems were almost never studied more than once, no critical evaluations or systematic comparisons of such data were possible. Simple chlorides (no complexes) of Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu are treated as the input substances. The literature (including a thorough coverage of papers in Chinese and Russian) has been covered through the middle of 2008.

Solubility of rare earth metal bromides and iodides in aqueous systems

“…For comparison, Fig. 1 also contains the recommended values of the solubility of rare earth metal chlorides at 298.2 K [ 1 – 3 ]. These values are precisely known within ±0.1%, and therefore they may be used as the reference data basis.…”

“… The predicted values were obtained by addition of 0.009 to the recommended solubilities of LnCl 3 in H 2 O at 298.2 K from Mioduski et al [ 1 – 3 ] …”

“…This is a brief assessment which is a continuation of the critical evaluation of solubilities of rare earth metal halides in water-containing systems. The part on solubilities of chlorides was already published [ 1 – 3 ]. It would seem that bromides and iodides of rare earth metals are less significant than chlorides.…”

Solid + Liquid Equilibria for the Systems CsBr + ErBr3 + H2O and CsBr + ErBr3 + HBr (∼12.3%) + H2O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

“…12−17 The related results of rare earth metal halide in aqueous systems were evaluated exhaustively. 18 In the binary systems, three types (type means the molar ratio of CsBr to REBr 3 ) new solid-phase compounds were obtained, including Cs 3 REBr 6 (3:1 type) (RE = La, Ce, Pr, Tb, Dy), Cs 3 RE 2 Br 9 (3:2 type) (RE = Tb, Dy), Cs 2 REBr 5 (2:1 type) (RE = La, Ce), and CsRE 2 Br 7 (1:2 type) (RE = La, Ce, Pr, Tb). In the ternary systems, 2CsBr·REBr 3 ·10H 2 O (2:1 type) (RE = La, Ce) were determined.…”

(Solid + liquid) equilibria for the ternary system (CsBr + LnBr3+ H2O) (Ln = Pr, Nd, Sm) at T= 298.2 K and atmospheric pressure, thermal and fluorescent properties of Cs2LnBr5·10H2O

“…The phase equilibria of binary systems (LnBr 3 + CsBr) (Ln = La, Ce, Pr, Tb, Dy) [5][6][7][8][9], ternary systems (CsBr + LnBr 3 + H 2 O) (Ln = La, Ce) [10] and quaternary systems (CsBr + LnBr 3 + HBr ($13 %) + H 2 O) (Ln = La, Ce, Pr, Nd, Sm, Dy) [11][12][13][14][15][16] were reported previously, and relevant results of rare earth metal halide in aqueous systems were evaluated importantly [17][18]. These studies provided the phase diagrams for scientists and engineers.…”