• Part of the book series (PMOC) Abstract An investigation of the electrical characteristics of a molecule gives important information on the distribution of charges in the molecule and provides the possibility of determining many properties of the molecule which depend on its electronic distribution. Those electrical properties of the molecule must be selected that are capable of a theoretical interpretation. The classical theory of the polarization of dielectrics shows that such properties of a molecule are exhibited in the behavior of the substance in an electric field.
A general theory of the dielectric constant of simple ionic crystals is proposed. The energy change due to the electric field is expressed by a quadratic form of quantities p x, p 1 and p 2, which represent the dipole moments due to the displacement of ions, the deformation of the negative ion and the deformation of the positive ion in the electric field respectively. Blofeld Software Editor Videos more. Using this formalism it is possible to derive several important relations concerning the dielectric properties of ionic crystals. When the polarizability of the positive ion is much smaller than that of the negative ion, we may be allowed to put p 2 =0.
In this case our quadratic formalism has only three unknown constants, which are determined by using three observed quantities. For NaCl we determine them by using κ 0, κ and β (the optical dielectric constant, the static dielectric constant and the compressibility). Then we discuss the pressure effect of dielectric constants from our standpoints, and then we have computed the Reststrahlenfrequenz of NaCl considering the ionic polarization. The result agrees well with observation. Finally we propose a method of determining the phenomenological repulsive potential between ions of ionic crystals, which may be more accurate than the previous one.
References References• 1 C. F.Bottcher: Theory of Electric Polarization. H.Frohlich: Theory of Dielectrics. Mott and Gurney: Electronic Processes in Ionic Crystals. G.Kirkwood: Jour. 4 (1936) 592.
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61 Chapter 2 THEORY OF DIELECTRICS 2.1 Theory of Homogeneous Dielectrics 2.2 Theory of Heterogeneous Dielectrics 2.3 Dielectric Loss and Dissipation Factor.
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