ISOTHERMAL COMPRESSIBILITY AND THERMODYNAMICS OF STRUCTURAL TRANSITIONS IN THE LIQUID SE-TE SYSTEM

Sound velocity, upsilon-s, has been measured to examine the thermodynamics of structural transitions in the liquid Se-Te system. The isothermal compressibility, K(T), deduced from upsilon-s together with the thermal expansion coefficient, alpha-p, the constant pressure specific heat, C(p), and the density shows a broad maximum when plotted as a function of temperature or concentration. It has been shown that K(T) is significantly enhanced by the structural change. Evidence has been presented that the Ehrenfest's relations are satisfied among the excess parts of K(T), alpha-p and C(p) associated with the structural change.