The construction of a phases tree of a ternary system with three binary compounds KCaCl3, K2BaCl4, CaBaCl4 is given. The phase tree includes four secondary phase triangles CaCl2–KCaCl3–СаBaCl4, CaBaCl4–KCaCl3–BaCl2, KCaCl3–BaCl2–K2BaCl4 and KCaCl3–CaBaCl4–KCl. These triangles are connected by three stable secants KCaCl3–СаBaCl4, KCaCl3–BaCl2, KCaCl3–K2BaCl4. Crystallizing phases in stable and secant elements correspond to the simplex tops. The presence of binary compounds on adjacent sides of the composition triangle made it possible to reveal, in addition to addition reactions, the reactions of mutual exchange. The description of the main reactions for mixtures corresponding to the intersection points of unstable and stable secants is carried out. The possibility of these reactions has been confirmed by thermodynamic calculation of thermal effects and Gibbs energies for standard conditions. Using the constructed tree of phases for any mixtures in a triangle of compositions, including 2...6 salts, a description of the chemical interaction by the ion balance method is carried out. The ion balance method allows you to determine the final composition after reaction in a secant or stable element. Complex gross-reactions are presented as a set of simpler reaction equations. The proposed method for description the chemical interaction can be used for other types of ternary systems with exchange reactions (metathesis) – with ion-exchange processes and with displacement reactions.

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The paper presents analytical and graphical dependences of the individual haloganides melts specific electrical conductivity æ of the sodium NaHal series (Hal – F, Cl, Br, I) on the halogen order number Z, ionic radius r of haloganide-ion Hal–, halogen ionic potential 1/r, reduced ionic radius r/Z, difference of electronegativity (∆χ = χ(Hal) – χ(Na)): æ = f(Z); æ = f(r); æ = f(1/r); æ = f(r/Z); æ = f(∆χ) for the temperature higher melting temperatures on 5, 10, 50, 75, 100, 150 и 200°. M.Kh. Karapetyans сomparative methods were applied for the description. The minimum standard deviation and maximum correlation coefficient corresponds to the equation æ–1 = a + bexp1/r, according to which the numerical values of æ(NaAt) are calculated for real temperatures. The temperature dependence æ of the NaAt melt is described by the equation æ = 0.0508+0.0023Т. A comparative analysis of the relationship between the specific electrical conductivity of NaHal melts at a temperature of Tm + n (n = 10 ... 200° higher the melting temperature) and æ at (Tm + 5°). A comparative analysis is represented by straightforward dependencies. It was shown that the specific electrical conductivity of the NaAt melt is related to the electrical conductivity of LiAt by the direct equation æ(NaAt) = 0.035+0.607æ(LiAt). The straight line equationalso relates æ of the NaHal melt (Hal – F, Br, I, At) to the specific conductivity of the NaCl melt. Between the numerical values of the specific electrical conductivity of the sodium astatide (NaAt) melt calculated by different methods, consistent data were obtained.