SOUND-VELOCITY AND COMPRESSIBILITY OF GA-PB LIQUID ALLOYS

The sound velocity in liquid alloys Ga1-xPbx (a = 0. 0.1. 0.2. 0.3, 0. 5, 0.6. 0.7, 0.8. 0.9, 1) has been measured in the range From monotect ic temperature up to 1100 K at a frequency of 30.3 MHz using a pulse p hase technique with varying the acoustic path length. The sound veloci ty in liquid alloys increases linearly with decreasing temperature unt il the temperature of the liquid-liquid phase separation is reached. T he concentration dependence of the adiabatic compressibility in the on e-phase region has a positive deviation from the ideal value. The temp erature coefficients of the sound velocity and the adiabatic compressi bility show large negative deviations from the linear concentration de pendence near the critical composition.