The Theory of the Dielectric Constant of Ionic Crystals III
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概要
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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. 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.
- 社団法人日本物理学会の論文
- 1955-08-05
著者
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Yamashita Jiro
Institute For Solid State Physics The University Of Tokyo
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Kurosawa Tatumi
Institute Of Science And Technology University Of Tokyo
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