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Article Dans Une Revue Journal of Colloid and Interface Science Année : 2005

Influence of relative humidity on electrical properties of alpha-Al2O3 powders : Resistivity and electrochemical impedance spectroscopy

Résumé

The influence of humidity on the electrical properties of α-Al2O3 powders has been investigated using adsorption isotherms, DC resistivity, and electrochemical impedance spectroscopy. Samples of two α-Al2O3 particle sizes were examined, both individually and mixed together. The results show that the grain-bed resistivity decreases with humidity, whereas the grain capacitance is almost constant. The resistivity difference between the two particle sizes is of several orders of magnitude, while the capacitance values are not very different. These results are interpreted in terms of the layer-by-layer growth of water adsorbed on the grain surfaces. The first, more tightly bound adsorbed layer does not provoke the same effects as those layers adsorbed at higher relative humidity.

Domaines

Matériaux

Dates et versions

hal-00096637 , version 1 (19-09-2006)

Identifiants

Citer

François Favre, Frédéric Villiéras, Yann Duval, Edward Mcrae, Christophe Rapin. Influence of relative humidity on electrical properties of alpha-Al2O3 powders : Resistivity and electrochemical impedance spectroscopy. Journal of Colloid and Interface Science, 2005, 286, pp.615-620. ⟨10.1016/j.jcis.2005.01.038⟩. ⟨hal-00096637⟩
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