Electrode Effects In Dielectric Spectroscopy Measurements On (Nb Plus In) Co-Doped Tio2
JOURNAL OF APPLIED PHYSICS(2016)
Abstract
Recently, several papers reported the discovery of giant permittivity and low dielectric loss in (Nb+In) co-doped TiO2. A series of tests was performed which included the measurement of the frequency dependence of the dielectric permittivity and alternating current (ac) conductivity of co-doped (Nb+In) TiO2 as a function of electrode type, sample thickness, and temperature. The data suggest that the measurements are strongly affected by the electrodes. The consistency between four-contact van der Pauw direct current conductivity measurements and bulk conductivity values extracted from two-contact ac conductivity measurements suggest that the values of colossal permittivity are, at least in part, a result of Schottky barrier depletion widths that depend on electrode type and temperature. Published by AIP Publishing.
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Key words
spectroscopy measurements,electrode effects,dielectric,tio<sub>2</sub>,co-doped
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