Molar volume and adiabatic compressibility in the molten Ag-Te system

Sound velocity and molar volume have been measured in the liquid Ag-Te syst em as a function of temperature and composition. Results obtained have bem used to deduce the compressibility and thermal expansion coefficient. The m olar volume and adiabatic compressibility show a distinct cusp at Ag2Te com position where the thermal expansion coefficient takes a minimum, which sug gests the existence of stable ionic association in the liquid. Between Ag a nd Ag2Te the adiabatic compressibility for an alloy with a miscibility gap shows a logarithmic temperature dependence being characteristic of the crit ical behaviour associated with the two-melt pha so separation. A very small two-melt region has been confirmed. Discussion has been made in comparison with the results for the isochemical system, Ag-Se.