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PRESSURE DEPENDENCE OF THE ELASTIC SHEAR CONSTANTS OF LI
CASE INST OF TECH CLEVELAND OHIO
The elastic shear constants C equals C sub 44 and C equals 12 C sub 11-C sub 12 of Li were measured as a function of pressure at room temperature. The measured values of the quantitydln Cdln r are, C equals 4.1 and C equals 2.8. This inequality of the two pressure variations is contrary to the situation found in Na, where the two coefficients were equal. Theoretically, the two coefficients are expected to be the same, if only the electrostatic interaction between the electrons and the ions is responsible for the elastic stiffness of the metal. The different behavior in Li can be understood in terms of the extra contribution to the shear constants arising due to the change in the Fermi energy of the electrons on shearing. Author