Fractal approach to ac impedance spectroscopy studies of ceramic materials
Nenhuma Miniatura disponível
Data
2001-11-01
Autores
Branković, Goran [UNESP]
Branković, Zorica [UNESP]
Jović, Vladimir D.
Varela, José Arana [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
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.
Descrição
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.