Accession Number : AD0621606

Title :   LOW TEMPERATURE ELASTIC CONSTANTS OF POTASSIUM.

Descriptive Note : Revised ed.,

Corporate Author : JOHN CARROLL UNIV CLEVELAND OHIO

Personal Author(s) : Marquardt,W. R. ; Trivisonno,J.

Report Date : 23 JUL 1964

Pagination or Media Count : 9

Abstract : The adiabatic elastic constants of single crystal potassium were measured as a function of temperature from 195 K to 4.2 K by the ultrasonic pulse-echo technique. The measured elastic constants at 4.2 K (in units of 10 to the 10th power dyn-cm 2) are as follows: C = 2.86, C' = 0.377, C sub n = 6.65, and B sub s = 3.66. The shear constants C and C' are interpreted in terms of Fuchs electrostatic contribution to the shear stiffnesses of the alkali metals. Significantly, this work yields an elastic anisotropy, C/C', at 4.2 K which is in agreement with Fuchs' theoretical calculation. The results are also compared to Bender's values of the elastic constants at 83 K and with Swenson's isothermal compressional data.

Descriptors :   (*POTASSIUM, ELASTIC PROPERTIES), (*ELASTIC PROPERTIES, LOW TEMPERATURE), CRYOGENICS, SINGLE CRYSTALS, ANISOTROPY, DENSITY, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE