Abstract
The effect of pressure on the elastic shear constants C = c 44 and C' = 1 2 (c 11 − c 12) of Al has been measured from -196° to +25°C and up to 2500 atm using the recently developed torsional-bar resonance technique. The pressure derivatives of both shear constants are found to decrease at lowering temperatures. The experimental results are compared with existing theories based on lattice anharmonicity. At lower temperatures, the Grüneisen parameter γ calculated from the results is in good agreement with the value obtained from thermal data.
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