Abstract
This chapter deals with the dielectric properties of ferroelectric solids: nonlinear dielectric solids. It begins with a brief description of the hysteresis effect and the classification of ferroelectric solids. The electric polarization and electric susceptibility in ferroelectrics have been obtained using the atomic dipole theory and it was found that the Curie-Weiss law is obeyed. Atomic theory provides the relationship between the microscopic and macroscopic physical quantities. In the case of the polarization catastrophe, high values of the dielectric constant are obtained, which exhibit the Curie-Weiss type of behavior. A thermodynamic study of ferroelectric solids is presented, which yields information about the first- and second-order phase transitions observed in ferroelectric solids. The behavior of the electric susceptibility and the change in entropy have been calculated during the phase transition from an unpolarized to a polarized state. At the end of the chapter, a brief account of ferroelectric domains was presented.
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