Ferroelectric phase transitions a review of theory and experiment

Publisher Website
Google Scholar
Abstract
In preceding parts devoted to experimental investigations of transport and relaxation processes, we have outlined those theories which were specifically designed to analyze the empirical results. Generally, such analysis starts with a model Hamiltonian, whose temperature-dependent force constants are adjusted to fit inelastic neutron dispersion curves or other empirical data. If cubic anharmonicity plays a significant role, as in the theory of thermal conductivity, it can be added to the model Hamiltonian, and qualitative conclusions can be derived concerning its effect on the temperature-dependence of the measurement being analyzed.