Fractal approach to ac impedance spectroscopy studies of ceramic materials

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Data

2001-11-01

Autores

Branković, Goran [UNESP]
Branković, Zorica [UNESP]
Jović, Vladimir D.
Varela, José Arana [UNESP]

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Resumo

A novel fractal model for grain boundary regions of ceramic materials was developed. The model considers laterally inhomogeneous distribution of charge carriers in the vicinity of grain boundaries as the main cause of the non-Debye behaviour and distribution of relaxation times in ceramic materials. Considering the equivalent circuit the impedance of the grain boundary region was expressed. It was shown that the impedance of the grain boundary region has the form of the Davidson-Cole equation. The fractal dimension of the inhomogeneous distribution of charge carriers in the region close to the grain boundaries could be calculated based on the relation ds = 1 + β, where β is the constant from the Davidson-Cole equation.

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Palavras-chave

Ceramics, Fractal, Grain boundary, Impedance spectroscopy, Model, Calculations, Carrier mobility, Charge carriers, Electric conductivity of solids, Electric impedance, Fractals, Grain boundaries, Mathematical models, Relaxation processes, Spectroscopy, Davidson-Cole equation, Inhomogeneous distribution, Non-Debye relaxation, Ceramic materials

Como citar

Journal of Electroceramics, v. 7, n. 2, p. 89-94, 2001.