Dielectric Properties of Materials Showing Constant-Phase-Element (CPE) Impedance Response

Mark E. Orazem (1) , Isabelle Frateur (2) , Bernard Tribollet (2) , Vincent Vivier (2) , Sabrina Marcelin (3) , Nadine Pébère (3) , Annette L. Bunge (4) , Erick A. White (4) , Douglas P. Riemer (5) , Marco Musiani (6)

1 UF|CHE - Department of Chemical Engineering [Gainesville]
2 LISE - Laboratoire Interfaces et Systèmes Electrochimiques
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 Departement of Chemical and Biological Engineering [Golden, CO]
5 Hutchinson Technology
6 Instituto per l'Energetica e le Interfasi

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.1,2 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 α is greater than 0.9.

Domaines: Autre; Chimie

Mark E. Orazem, Isabelle Frateur, Bernard Tribollet, Vincent Vivier, Sabrina Marcelin, et al.. Dielectric Properties of Materials Showing Constant-Phase-Element (CPE) Impedance Response. Journal of The Electrochemical Society, 2013, 160 (6), pp.C215-C225. ⟨10.1149/2.033306jes⟩. ⟨hal-00804229⟩