The Thermodynamic Properties of Solid and Fluid Helium-3 and Helium-4 Above 3 K at High Densities

Download or read book The Thermodynamic Properties of Solid and Fluid Helium-3 and Helium-4 Above 3 K at High Densities written by John Sydney Dugdale and published by . This book was released on 1963 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).