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

Mouna Jabli Zouaoui; Benoît Nait-Ali; Nicolas Glandut; David Smith

doi:10.1016/j.jeurceramsoc.2015.09.008

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

Mouna Jabli Zouaoui ¹ Benoît Nait-Ali ¹ Nicolas Glandut ² David Smith ¹

1 SPCTS - Science des Procédés Céramiques et de Traitements de Surface

2 SPCTS-AXE2 - Axe 2 : procédés plasmas et lasers

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

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.

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Sciences de l'ingénieur [physics] / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-01875310
Contributeur : Beatrice Derory <>
Soumis le : lundi 17 septembre 2018 - 11:09:47
Dernière modification le : mardi 18 septembre 2018 - 01:14:31

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

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

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