Accession Number : AD0746838

Title :   Acoustics Measurements in Molten Rubidium at High Pressures,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Rosenbaum,Ira J.

Report Date : 26 APR 1972

Pagination or Media Count : 99

Abstract : Velocity of sound in molten rubidium has been measured over the range 40-200C and 0-20,000 PSI. The data was best fit by a polynomial which was linear in temperature and quadratic in pressure. Using an iterative technique, density, thermal expansion and isothermal compressibility were calculated over the range of the measurements. The change of internal energy, entropy and free energy with temperature and pressure were then calculated from the P-V-T data. The entropy of rubidium was used to estimate an effective hard sphere diameter and its variation with temperature and pressure for a model based on a perturbation expansion of the Helmholz free energy. Cohesive energies calculated to about one percent. Derivatives of the free energy expansion were taken with respect to volume and sound velocities were calculated. (Author)

Descriptors :   (*LIQUID METALS, ACOUSTIC PROPERTIES), (*RUBIDIUM, THERMODYNAMICS), FREE ENERGY, SOUND TRANSMISSION, DENSITY, THERMAL EXPANSION, COMPRESSIVE PROPERTIES, ENTROPY, THESES

Subject Categories : Physical Chemistry
      Metallurgy and Metallography
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE