Dielectric Properties of Materials Showing Constant-Phase-Element (CPE) Impedance Response
Academic Article
Publication Date:
2013
abstract:
Constant-Phase Elements (CPE) are often used to fit impedance data arising from a broad range of experimental systems. Four
approaches were used to interpret CPE parameters associated with the impedance response of human skin and two metal oxides in
terms of characteristic frequencies and film thickness. The values obtained with each approach were compared against independent
measurements. The power-law model developed recently by Hirschorn et al. provided the most reliable interpretation for systems
with a normal distribution of properties. Readers are cautioned that the CPE parameter Q does not provide an accurate value for
capacitance, even when the CPE exponent ? is greater than 0.9.
approaches were used to interpret CPE parameters associated with the impedance response of human skin and two metal oxides in
terms of characteristic frequencies and film thickness. The values obtained with each approach were compared against independent
measurements. The power-law model developed recently by Hirschorn et al. provided the most reliable interpretation for systems
with a normal distribution of properties. Readers are cautioned that the CPE parameter Q does not provide an accurate value for
capacitance, even when the CPE exponent ? is greater than 0.9.
Iris type:
01.01 Articolo in rivista
Keywords:
Characteristic frequencies; Constant phase element; Experimental system; Impedance data; Impedance response
List of contributors:
Musiani, Marco
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