Accession Number : AD0454441


Title :   THE THERMODYNAMIC PROPERTIES OF SOLID AND FLUID HELIUM-3 AND HELIUM-4 ABOVE 3 K AT HIGH DENSITIES,


Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY


Personal Author(s) : Dugdale,J S ; Franck,J P


Report Date : 14 Oct 1963


Pagination or Media Count : 29


Abstract : Measurements have been made of the specific heat at constant volume of solid He-3 from 3 K up to the melting point at a number of different densities corresponding to pressures up to 2000 atm. The measurements have been extended through the melting region at constant volume up to 29 K in the fluid phase. For comparison similar measurements have been made on He-4 at four different densities. By combining these data with the p-V-T data of Mills + Grilly (1955) and Grilly + Mills (1959), the complete thermodynamic properties of the solids have been derived in the relevant pressure and temperature range. The results can be understood semi-quantitatively in terms of the zero-point energy of the solids and a quasi-harmonic model of the lattice vibrations. A brief discussion of the specific heat of the fluid phase is also given. (Author)


Descriptors :   *HELIUM , PHASE STUDIES , UNITED KINGDOM , THERMODYNAMICS , MEASUREMENT , SPECIFIC HEAT , VOLUME , HIGH PRESSURE , DENSITY , PRESSURE , TRANSITION TEMPERATURE , LIQUEFIED GASES , SOLIDIFIED GASES , MELTING , CHEMICAL EQUILIBRIUM , ENERGY , VIBRATION , ISOTOPES


Distribution Statement : APPROVED FOR PUBLIC RELEASE