Effect of humidity on the dielectric constant and electrical impedance of mesoporous zirconia ceramics

Abstract : The effect of humidity on the dielectric constant and electrical impedance of porous 8 mol% yttria stabilized zirconia ceramic is examined. Samples with pore volume fractions from 33% to 55% were prepared from a fine powder by uniaxial pressing and firing. Measurements, in different relative humidities from <3% to 100%, showed a strong increase of dielectric constant with water content of the unfired and fired porous ceramics. The dielectric constant can be described with good agreement to experimental values using a 2 step model involving the Hashin-Shtrikman upper bound and Landauer’s effective medium relation, analogous to the behavior of thermal conductivity. Water is assumed to be located as a layer of variable thickness on the interior solid surfaces of the pores. A.c. impedance measurements also reveal a short circuit of insulating dielectric behavior at higher water contents, interpreted as surface conduction of protons.
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Contributeur : Beatrice Derory <>
Soumis le : lundi 17 septembre 2018 - 11:09:47
Dernière modification le : mardi 18 septembre 2018 - 01:14:31

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Mouna Jabli Zouaoui, Benoît Nait-Ali, Nicolas Glandut, David Smith. Effect of humidity on the dielectric constant and electrical impedance of mesoporous zirconia ceramics. Journal of the European Ceramic Society, Elsevier, 2016, 36 (1), pp.163 - 169. ⟨10.1016/j.jeurceramsoc.2015.09.008⟩. ⟨hal-01875310⟩

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