THE RESEARCH OF BISMUTH ORTHOGERMANATE IMPEDANCE BY EQUIVALENT CIRCUITS METHOD
Journal: Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) (Vol.1, No. 28)Publication Date: 2016-10-27
Authors : T. M. Bochkova S. M. Plyaka N. O. Truseeva;
Page : 50-53
Keywords : impedance hodograph; bismuth orthogermanate; charge transport;
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Abstract
Using a computer approximation of impedance hodographs within the method of equivalent circuits it was found that the impedance spectrum of Bi4Ge3O12 single crystals at temperatures above 600 K contains three semicircles. It corresponds to Voigt circuit from three RC parallel circuits. It is suggested that high-frequency process of charge transport is caused by the hole conduction through volume of the crystal sample and mid-frequency process is connected with the migration of the space charge which appears near contacts due to the depletion of the majority carriers as a result of the recombination.
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