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Issue 5, 2002
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Dispersive charge carrier mobility in a surface oxide layer

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Abstract

The electrode impedance spectrum of the oxide produced on a Zr–1%Nb surface in an aqueous solution at 290 °C is analysed as a function of temperature between 20 °C and 290 °C. The portion of the spectrum, relevant to the oxide, is treated in terms of a parallel CPE∥Rox equivalent circuit (CPE denoting constant phase element, Rox ohmic resistor). Considering also the effect of temperature CPE is understood as a dispersive resistance described by the continuous time random walk theory of Scher and Lax. Distinction is made between the kinetics of oxide growth and of non-Faraday charge transport, the time constant of the latter being obtained directly from impedance data.

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Article information


Submitted
30 Jul 2001
Accepted
04 Dec 2001
First published
29 Jan 2002

Phys. Chem. Chem. Phys., 2002,4, 791-794
Article type
Paper

Dispersive charge carrier mobility in a surface oxide layer

G. Nagy and R. Schiller, Phys. Chem. Chem. Phys., 2002, 4, 791
DOI: 10.1039/B106848B

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