213.57.15.125 at 15:15, 22 November 2014

2014-11-22T15:15:59Z

141.30.71.116 at 13:18, 14 July 2010

2010-07-14T13:18:13Z

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A '''constant phase element''' is an [[equivalent electrical circuit]] component that models the behaviour of a [[double layer (electrode)|double layer]], that is an imperfect [[capacitor]].

The electrical [[electrical impedance|impedance]] can be calculated:
:<math>Z_{CPE}=\frac{1}{Y_{CPE}}=\frac{1}{Q_0\omega^n}e^{-\frac{\pi}{2}ni}</math>
where the CPE [[admittance]] is :<math>Y_{CPE}=Q_0(\omega i)^n</math> and Q0 and n (0<n<1) are frequency independent.<ref>{{cite journal|last=Kochowski|first=S|coauthors=K. Nitsch|title=Description of the frequency behaviour of metal-SiO2-GaAs structure characteristics by electrical equivalent circuit with constant phase element|journal=Thin Solid Films|date=21 May 2002|volume=415|pages=133–137|url=http://144.206.159.178/ft/1035/72608/14075937.pdf|accessdate=22 October 2012}}</ref>

Q0 = 1/|Z| at ω = 1 rad/s

The constant phase is always −(90*n)°, also with n from 0 to 1. The case n = 1 describes an ideal capacitor while the case n = 0 describes a pure [[resistor]].

A '''constant phase element''' also appears currently in modeling the behaviour of the imperfect dielectrics. The generalization in the fields of imperfect electrical resistances, capacitances and inductances leads to the general "Phasance" concept :
http://fr.scribd.com/doc/71923015/The-Phasance-Concept

Constant phase elements are also used in equivalent circuit modelling and data fitting of [[electrochemical impedance spectroscopy]] data.

{{Reflist}}

[[Category:Electronic circuits]]

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Bounded deformation - Revision history

213.57.15.125 at 15:15, 22 November 2014

141.30.71.116 at 13:18, 14 July 2010