Abstract
Ultrasonic absorption and velocity measurements have been made in potassium-rubidium and sodium-cesium alloys at temperatures from their melting points to 250°C. Sound velocities decrease linearly with increasing temperature. Rao's constant and Wada's constant computed from the sound velocity data vary almost linearly with concentration. Absorption measurements in sodium-cesium alloys suggest a substantial molecular association, but potassium-rubidium alloys do not exhibit any detectable molecular association. The distilled liquid metals were transferred to the measurement apparatus and were studied under a high-purity argon cover gas. The transducer was in direct contact with the sample without the aid of adhesives or bonding agents. [This work was supported, in part, by the Office of Naval Research.]
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