Accession Number : AD0427834


Title :   PRESSURE DERIVATIVES OF THE SINGLE CRYSTAL ELASTIC CONSTANTS OF POTASSIUM,


Corporate Author : CASE INST OF TECH CLEVELAND OHIO


Personal Author(s) : Smith,Paulen A


Report Date : Dec 1963


Pagination or Media Count : 34


Abstract : The elastic stiffness constants of single crystal potassium and their pressure derivatives were measured at room temperature by the ultrasonic pulse echo method. The results were interpreted in terms of Fuchs' theory of the electrostatic contribution to the shear stiffnesses of the alkali metals. The experimental observation that the elastic anisotropy, C/C', does not depend on pressure indicates that, as Daniels found for sodium, it is not necessary to include an ion core interaction or a Fermi contribution to the shear stiffnesses in order to account for the results. The latter conclusion is consistent with a spherical Fermi surface. The bulk modulus and its pressure dependence fit very well the simplest model of the binding energy. (Author)


Descriptors :   *POTASSIUM , *PRESSURE , MEASUREMENT , ULTRASONIC RADIATION , ALKALI METALS , ANISOTROPY , ELECTROSTATICS , HYPERBARIC CONDITIONS , SCIENTIFIC RESEARCH , ATOMIC PROPERTIES , ETCHED CRYSTALS , SYMMETRY(CRYSTALLOGRAPHY) , CRYSTAL GROWTH


Distribution Statement : APPROVED FOR PUBLIC RELEASE