Measurement of the elastic constants of argon from 3 to 77 degrees K

The velocity of sound has been measured in argon single crystals by the pulse-echo technique for both longitudinal and transverse waves from 3 to 77 degrees K. The values of the elastic constants obtained by extrapolation of the results to 0 degrees K are: c11=4.39, c12= 1.83 and C44=1.64, in units of 109N m-2. Comparison with several lattice dynamical models indicates that models incorporating only central two-body forces are inadequate. New values for the adiabatic bulk modulus permit more accurate calculation of the Debye characteristic temperature and the Gruneisen parameter.

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