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Principle of the impedance spectroscopy technique

This technique consists of working with an alternating current 1 = f exp. /(cL)t+9) produced by the presence of a sinusoidal voltage U of pulsation . This sinusoidal current sustains a phase shift cp in the material because of the present capacitive elements. [Pg.191]

The impedance Z ( ) = Z exp(-z is therefore defined as the ratio I/U, so it is a complex number with a real part RfZ) and an imaginary part /m(2), thus  [Pg.191]

We will use, during the following applications, a Cartesian representation of Z in the complex plane (real part as x-coordinate, imaginaiy part as y-coordinate). This representation is also called the Nyquist representation. [Pg.191]

In the Cartesian representation of the complex plane, this eqnation is represented by a R/2 radius semicircle whose center is on the x-axis at (r + y). [Pg.193]

In the case where we have ideally polarizable electrodes, the material-electrode interface has to be characterized at low frequencies by a purely capadtive effed. The jt/2 phase shift caused by a capacitor is therefore represented on the Nyqnist diagram by a vertical line. [Pg.193]


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