functions are the change of sign of the excessive Gibbs energy of formation and the excessive entropy of formation. This phenomenon is analogous to the inversion of the compressibility factor for one-component liquids in the negative range of values of second virial coefficient. Corresponding to these results, mutual alloys of the metals studied are not only non-ideal solutions, but being real solutions, were in different thermodynamic classes depending on the temperature and size factor [11] .The analysis lead to the possibility of separate ranges of existence for each class and particularly to an explanation of the anomaly [16] of deviation from Roult's law which has been displayed in independent measurements of saturation pressure. The results on concentration and temperature dependencies of the short-range order parameter, energies of inter-particle interaction, and concentration correlation function : • explain the contraction of studied alloys [17], • explain the anomalies in acoustic [18] , electromagnetic [19] properties and NMR spectra [20] • display the correlation with phase diagrams and point towards understanding of the properties of some liquid-metal system properties. Acknowledgements The author wishes to express his gratitutde for support from the Russian Foundation for Basic Research (RFBR) under grant number 94-02-05512-a References [1] Lokshin,E.P., Ignatjev,O.C. Activities of components in Na-K, Na-Rb and Na-Cs alloys. Thermophysics of High Temperatures, 1971, v9, No.l, p.94, 1975, vl3, No.l, p.75. [2] Lantratov,M.F. Thermodynamic properties of liquid NaK alloys. Joum. Appl.Chem., 1973, No.7, p.1485. [3] Ichikawa,K., Granstaff,S.H., Thompson,J.C. Chemical potentials and related thermodynamics in liquid NaCs alloys. Joum.Chern.Phys., 1974, v61, No. 10, p.4059; 1973 ,v59, No.4, p. 1680; Joum.Phys.F, 1974, v4, No.l,p.L9 [4] Neale,F.E., Cusack,N.E. Thermodynamic properties of liquid NaCs alloys. Joum.Phys.F: Metal Physics,1982,vl2, No. 12, p.2839; Joum. of Noncristalline Solids, 1984, v 61/62, Parti, p.169 [5] Cafasso,F.A., Khanda,V.M., Feder,H.M. Thermodynamic properties and ordering in liquid Na-K alloys. Advances in Physics, 1967, vl6, No.63, p.535
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