Interfacial Polarization Effects Associated with Surfaces and Interfaces
The dispersion of the capacitance and conductance of a specimen with frequency, arising from the presence of interfaces between regions of differing dielectric properties, can be used to study the geometry and electrical properties of the more conducting regions. The measurement and interpretation of these interfacial polarization effects are discussed, with particular emphasis on their application to studies of surface effects in single crystals. The results of experimental studies of the variation in electrical properties of relatively thick (approximately 10μ) surface layers in sapphire produced by the adsorption and desorption of gases, incomplete equilibration of composition in various oxygen partial pressures, and the presence of impurities and preliminary results of interfacial polarization studies in sodium chloride crystals are presented.
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