Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 1, pp. 27−30.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
O.N. Tril’ , A.G. Morachevskii, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 1, pp. 29−32.
OF SYSTEMS AND PROCESSES
Thermodynamical Analysis of Liquid Alloys
for Rubidium–Lead–Potassium System
O. N. Tril’ and A. G. Morachevskii
St. Petersburg State Polytechnical University, St. Petersburg, Russia
Received November 12, 2009
Abstract—Integral molar Gibbs energy of liquid alloys of rubidium–lead–potassium ternary system at temperature
873 K was computed based on data on boundary binary systems with the aid of geometric and polynomial
n the past 10–15 years, the calculations of
thermodynamic properties of ternary and more complex
liquid metal systems on the basis of data on boundary
binary systems attract great attention. Overview of
the main computational methods is contained in ,
and in a number of general works [2–7]. Various
geometric models, and to a lesser degree polynomial
methods, quasi-chemical approaches are most widely
used in the calculations. In essence, a premise that
the thermodynamic properties of systems containing
three or more components are determined by pair
interactions, underlies all theories. Geometric models in
all their diversity differ only by a way to account for the
contribution made by each of the boundary systems to
the value of the integral thermodynamic characteristics
(Gibbs energy, excess Gibbs energy, enthalpy of mixing)
of ternary or more complex system.
Results of computations of the integral molar Gibbs
energy of the liquid alloys of rubidium–lead–potassium
system according to various techniques were compared
in our paper. An experimental study of such a system of
two components with similar properties is quite complex.
Information about the thermodynamic properties of the
liquid alloys of alkali metals and lead are of interest for
processes involving the use of liquid-metal electrodes
Four models: (I) Bonnier, Toop (II), Kohler (III) and
(IV) Muggianu models, and Redlich–Kister polynomial
were used in calculations. In the ﬁ rst case (model I and
II) the result of the calculation depends on the assumed
location of components in relation to a radial section,
along which is computed (Fig. 1a). In the second
case, all the three boundary systems are equal, a share
contribution of each binary system is determined only
by the composition of the ternary alloy, for which the
integral value is computed (Figs. 1b, 1c).
Calculated expressions for all four models were shown
in Table. 1. In performing such computations a selection
Fig. 1. Scheme for calculation of integral molar Gibbs energy according to models (a) I, II, (b) III, (c) IV. (A, B, C) compositions of the
boundary binary systems; (О) composition of the ternary system.