Crystal growth and dislocations by Ajit Ram Verma

By Ajit Ram Verma

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The interfacial polarization is frequently encountered in multicomponent dielectric systems. Some ELECTRIC POLARIZATION 375 properties of the interfacial polarization will be discussed later in connection with the decay of the current in heterogeneous dielectrics (§ 2 in Chap. VIII). The high-voltage polarization represents macroscopic displacements of charged particles in solid dielectrics under the action of strong electric fields. Such displacements give rise to an ionic or electronic space charge, which is positive near the cathode and negative near the anode.

In the case of dielectrics exhibiting multiple-cell structure we can also have states with "linear" and "volume" antiparallel orientations of the dipoles. These two states are achieved easily by pairing dipoles in such a way that their orientations are anti parallel. The first of these states corresponds to pairing along a unique direction in a crystal and the second corresponds to pairing along several equivalent directions in polar-neutral structures. Each of these states has its own dipole energy.

It is evident from Table 37 that the electronic polarizabilities of all atoms and ions are of the order of 10-24 cm3• The electronic polarizability can be calculated easily using the classical theory. , where {3 is the elastic force constant and m is the mass of the electron. Resonance absorption takes place at this frequency. The average displacement of the electron, i, caused by an electric field, F, can be found from the condition eF = ~x = mW~il. 24) where r is the radius of the electron orbit.

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