Phase equilibrium system of RbCl-PrCl3-HCl(12.86 mass %)-H2O at 298.15 K and standard molar enthalpy of formation of new solid-phase compound

Phase Equilibrium in the System RbCl−NdCl3−HCl(13.26 %)−H2O at 298.15 K and Standard Molar Enthalpy of Formation of New Solid Phase Compound

“…Comparing the reported quaternary systems − with the present quaternary system, for the five quaternary systems RbCl−RECl 3 −HCl(∼13 %)−H 2 O (RE = La, Ce, Pr, Nd, Sm), their phase chemical reactions have comparability because they all have a 1:1 type compound. The new solid compounds RbRECl 4 ·4H 2 O (RE = La, Ce, Pr, and Nd) are congruently soluble, and their phase regions are big; however, the phase region of the new solid compound RbNdCl 4 ·4H 2 O is comparatively smaller than that of RbRECl 4 ·4H 2 O (RE = La, Ce, and Pr).…”

“…The compound RbGdCl 4 ·4H 2 O is uncongruently soluble, and its phase field is very small in the medium of ∼21.65 % HCl. We re-examined the RbCl−LaCl 3 −HCl−H 2 O, RbCl−CeCl 3 −HCl−H 2 O, RbCl−PrCl 3 −HCl−H 2 O, and RbCl−SmCl 3 −HCl−H 2 O systems and confirmed that the RbCl−LaCl 3 −HCl−H 2 O system is composed of three equilibrium solid phases: RbCl, RbLaCl 4 ·4H 2 O, and LaCl 3 ·7H 2 O, respectively. For the RbCl−RECl 3 −HCl−H 2 O (RE = Ce, Pr, Sm) systems, three similar equilibrium solid phases (RbCl, RbRECl 4 ·4H 2 O, and RECl 3 · n H 2 O; n = 6, 7) were observed.…”

“…The total time required for complete dissolution was about 15 min. Comparing the reported quaternary systems [1][2][3][4][5] with the present quaternary system, for the five quaternary systems RbCl-RECl A single crystal of RbNdCl 4 • 4H 2 O with approximate dimensions of 0.21 mm × 0.17 mm × 0.13 mm was selected for the structure analysis. The compound RbNdCl 4 • 4H 2 O belongs to an orthorhombic system, with space group P21212, a ) 0.6986(6) nm, b ) 1.1319(1) nm, c ) 0.6665(6) nm, Dc ) 2.795 g • cm -3 , and Z ) 2.…”

“…Optical investigation shows they have up-conversion fluorescence properties in the infrared region at all temperatures between (10 and 295) K. The phase chemical relation of RbCl (KCl) with RECl 3 (RE ) La, Ce, Pr, Sm, Gd) in the medium of ∼13 % or ∼22 % HCl at 298.15 K has been reported. [2][3][4][5][6] Compounds of the 1:1 type (RbRECl 4 • 4H 2 O) were obtained from these systems. Wang et al 2 reported the presence of two equilibrium solid-phase regions (KCl and GdCl 3 • 6H 2 O) in the KCl-GdCl 3 -HCl-H 2 O quaternary system.…”

“…The compound RbGdCl 4 • 4H 2 O is uncongruently soluble, and its phase field is very small in the medium of ∼21.65 % HCl. We re-examined the RbCl-LaCl 3 -HCl-H 2 O, 3 RbCl-CeCl 3 -HCl-H 2 O, 4 RbCl-PrCl 3 -HCl-H 2 O, 5 and RbCl-SmCl 3 -HCl-H 2 O 6 systems and confirmed that the RbCl-LaCl 3 -HCl-H 2 O system is composed of three equilibrium solid phases: RbCl, RbLaCl 4H 2 O are congruently soluble, and their phase fields are big in the medium of ∼13 % HCl. But the compound RbSmCl 4 • 4H 2 O is uncongruently soluble, and its phase field is small in the media of (12.84 and 22.66) % HCl.…”