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Accession Number:
AD0670520
Title:
PRESSURE DERIVATIVES OF THE ELASTIC CONSTANTS OF RUBIDIUM.
Corporate Author:
CASE INST OF TECH CLEVELAND OHIO
Report Date:
1968-05-01
Abstract:
The pressure variation of the elastic stiffnesses of rubidium was measured at 195K by the ultrasonic pulse echo method. The values found are dC44dP 1.48 dCdP 0.229 dB sub sdP 3.63. The notation C C11-C122, B sub s C112C123 was used. The results were compared with the predictions of the Fuchs theory of the electrostatic contribution to the shear stiffnesses of the alkali metals. The experimental observation that the elastic anisotropy C44C depends somewhat on pressure suggests the presence of another, minor, contribution to the shear stiffnesses, but the sense of the pressure dependence of C44C is not accounted for by including an ion core interaction or a Fermi contribution. The bulk modulus and its pressure derivative are well described by the simplest model of the binding energy. The ultrasonic Murnaghan equation of state fits well the compression data of Swenson. Values of the temperature coefficients, at constant volume, of the elastic stiffnesses are presented. Author
Descriptive Note:
Technical rept.,
Supplementary Note:
Rept. on Solid State Physics Program.
Pages:
0038
Contract Number:
Nonr-1141(05)
File Size:
0.00MB
