Measurements of longitudinal and transverse ultrasonic wave velocities in compressed solidified argon and their relationship to melting theory

Measurements of longitudinal and transverse ultrasonic wave velocities have been made on compressed, solidified argon for pressures up to 6 kbar (600 MPa) corresponding to melting temperatures in the range 123–206 K. Velocities in the solid phase were measured along isochores to within ∼10−3 K of the melting line. The Lindemann melting parameter, obtained from appropriate physical quantities at the melting line, was constant within the limits of error of the measurement (±2%).