Search

Quantum Crystals.- 1. Plenary Topics.- Quantum Crystals: Theory of the Phonon Spectrum.- Quantum Solids and Inelastic Neutron Scattering.- Magnetic and Thermal Properties of Solid and Liquid 3He Near the Melting Curve.- 2. Helium Lattice Dynamics.- 2.1 Specific Heat and Sound.- Specific Heat of Solid 3He.- The Temperature Dependence of the Longitudinal Sound Velocity of Single Crystals of HCP 4He.- Lifetimes of Hypersonic Phonons in Solid 4He.- Sound Wave Propagation and Anharmonic Effect in Solid 3He and 4He.- 2.2 Heat Transport in Isotope Mixtures.- NMR Measurements on 3He Impurity in Solid.

Quantum Crystals.- 1. Plenary Topics.- Quantum Crystals: Theory of the Phonon Spectrum.- Quantum Solids and Inelastic Neutron Scattering.- Magnetic and Thermal Properties of Solid and Liquid 3He Near the Melting Curve.- 2. Helium Lattice Dynamics.- 2.1 Specific Heat and Sound.- Specific Heat of Solid 3He.- The Temperature Dependence of the Longitudinal Sound Velocity of Single Crystals of HCP 4He.- Lifetimes of Hypersonic Phonons in Solid 4He.- Sound Wave Propagation and Anharmonic Effect in Solid 3He and 4He.- 2.2 Heat Transport in Isotope Mixtures.- NMR Measurements on 3He Impurity in Solid.

Application of quantum theory to the condensed permanent gases by J. De Boer, resulted in a modified law of corresponding states in terms of reduced P, V, and T variables, plus a parameter A*. On the basis of this theory, De Boer and Lunbeck predicted a number of properties of the helium isotope of mass three. Several of these properties, including the vapor pressure, were subsequently determined, and the experimental results agree quite closely with those predicted by De Boer and Lunbeck. In the present paper, De Boer's theory is applied to tritium. Since the prediction of the He properties involved a graphical extrapolation, whereas the prediction of the tritium properties involves an interpolation, it is hoped that an even closer agreement between theoretical and experimental results will be observed when data on tritium become available.