Complex impedance spectra analysis of SnO₂-glaze composites

Abstract

SnO₂-glaze composites were prepared by Sb-doped SnO₂ and SiO₂−CaO−Al₂O₃−B₂O₃ glaze. The composites changed from an electrical insulator to a conductor as the SnO₂ content increased from Owt% to 90 wt%. The complex impedance spectra of the fabricated composites were investigated in the frequency range of 100Hz-40 MHz and three kinds of typical shape of complex impedance spectra were recorded and analyzed. The spectrum is quite close to the model of conduction via nonohmic contacting when the SnO₂ content is relatively low. In high loading region, the spectrum shows the conduction pattern through ohmic contact chains. In the moderate loading region, the model is a mixture of the above two models. Equivalent circuit of the composite changes from resistor-capacitor circuit to resistor-inductor circuit as the content of SnO₂ increases.

Keywords

SnO₂-glaze composites / impedance spectra / conduction model

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