Date of Award


Degree Type


Degree Name

Master of Science in Physics



First Advisor

Stephen V. Letcher


The pulse-echo technique has been used to measure ultrasonic absorption and velocity in Na-K and Na-Rb alloys. Data were taken at temperatures from -5° C to 250° C using frequencies from 15 MHz to 105 MHz. It has been found that both Na-K and Na-Rb have absorption peaks near 67 atomic percent Na. The magnitude of the absorption was found to be much greater in the Na-Rb solutions. The results in Na-Kare consistent with previously reported measurements that were attributed to the equilibrium process 2Na + K⇌Na2K. However, it is further speculated that the high attenuation in Na-Rb Is due to a critical phase separation.



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