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- W2070512704 abstract "The Maxwell-Wagner theory and the method of the Cole-Cole diagram are applied to the analysis of a.c. impedance measurements on photoconductors containing high resistive layers brought about, for instance, by the grain boundaries of powdered materials. This analysis has advantages over the previous treatment since it derives the conductivity σ of the material from the dependence of the dissipation upon ω. Thus the knowledge of the geometrical distribution of the conducting particles in the insulating matrix does not enter into this determination. Further, one can determine when and why the simple model of describing a conducting element by a capacitor shunted by a photoresistor is not completely correct. The analysis is applied to experimental results obtained from crystalline powdered ZnCdS photoconductors. It is found that single individual grains have not exactly the same conductivity but that a spread of conductivities exists and that for low excitation of the sample the capacity of the conducting portion is not completely constant; its apparent fractional volume decreases with decreasing excitation slightly in one case and by thirty-five per cent in another. This is attributed to the finite thickness of the layers (Debye layers) in which the charge carriers accumulate at the grain boundaries. In spite of these deviations from the simple model of a capacitor with parallel resistor, it is still possible to determine the conductivity of the material. With this method the decay of conductivity is determined for two phosphors; this decay follows a 1t law over two orders of magnitude of σ." @default.
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- W2070512704 date "1962-08-01" @default.
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- W2070512704 title "Ac impedance measurements of photo-conductors containing blocking layers analysed by the Maxwell-Wagner theory" @default.
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- W2070512704 doi "https://doi.org/10.1016/0022-3697(62)90124-5" @default.
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