Isodimorphic co-crystallization of isostructural ammonium chloro- and bromo-carnallites

Thermodynamic study of (b1LiBr +b2MgBr2)(aq), wherebdenotes molality, at the temperature 348.15K

“…The applicability of this approach has been proved with a series of other ternary (13,14,21) and multicomponent (3) aqueous solutions. The main problem was the choice of Pitzer binary parameters for LiBr(aq) and MgBr 2 (aq) at T=348.15 K. The absence of initial isopiestic results on these solutions at temperatures differing from the standard and on dependences reflecting the effect of temperature on the parameter values did not allow direct determination of b (0) , b (1) , and C f . The parameter values were calculated using the method of Apelblat and his colleagues.…”

“…(1) , and C f which take into account the interionic interactions of two ions and three ions; determination of the Pitzer ternary parameters u Li, Mg and c Li, Mg, Br characterizing the interaction between two different ions of the same sign and the interaction between three ions, respectively; and calculation of the solubility isotherm of the three-component solution. The applicability of this approach has been proved with a series of other ternary (13,14,21) and multicomponent (3) aqueous solutions.…”

“…That is why these solutions and the chlorocarnallites, bromocarnallites, and iodocarnallites themselves have been the subject of many studies. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) It has been established that only carnallite-type double salts MX·MgX 2 ·6H 2 O (1−1−6) crystallize in a broad temperature range from the (b 1 MX+b 2 MgX 2 )(aq) solutions where M denotes NH 4 , K, Rb, or Cs, X denotes Cl or Br, and b denotes molality. (7)(8)(9) The only exception are the solutions with the participation of LiX.…”

Discontinuities in the mixed-crystal series of isostructural carnallite-type double salts

“…In a previous paper, (19) the co-crystallization of isostructural ammonium chloro-and bromo-carnallites was investigated and the formation of a discontinuous series of mixed crystals was established. It was concluded that a continuous series of mixed crystals should be formed by the pairs of carnallite-type double salts which not only are isostructural but also have close unit-cell parameters.…”

Thermodynamics of the formation of solid solutions of the type (Me,Me′)SeO4·6H2O where Me and Me′ denote Mg, Co, Ni, or Zn from aqueous solutions

“…(27) To prove this, we have calculated the molarities in the hypothetic eutectic for the four calculated systems in two ways: using the u MN ( [1][2][3][4] regular mixing model, which is also applied in references [19][20][21][22]30, and generalizing the results by a simplified correlation equations of the type: Table 5 shows the values of the thermodynamic mixing parameter A obtained from the data on D mix G m (s) available in the literature (2nd column), and after application of equation (1) On the basis of the data obtained in the present paper it may be concluded that all the four types of mixed (Me,Me')SeO 4 ·6H 2 O crystals are close to the ideal (1) and (2) (1,3,31) The results of investigations on the co-crystallization of isostructural double salts with different stoichiometric composition have been summarized in previous studies. (21,32,33) It has been established that the formation of a continuous mixed-crystals series of isostructural salts depends on close values of the unit cell parameters. The parameter DV:…”