4.7 Article

In-situ measurements by impedance spectroscopy of highly resistive alpha-alumina

Journal

CORROSION SCIENCE
Volume 48, Issue 1, Pages 243-257

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2004.11.027

Keywords

aluminium oxide; impedance spectroscopy; ionic conductivity; high temperature corrosion

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In-situ impedance spectroscopy has been used for characterisation of oxides at elevated temperatures. However, for highly resistive oxides, the influence of electrode contact and leakage currents due to gas phase and surface conduction needs to be taken into account. In this study, IS measurements of pure and dense alpha-alumina (alpha-Al2O3) samples were performed in the temperature range 400-1000 degrees C with different types of electrode contact, in air and in nitrogen. The results show that above 700 degrees C the influence is negligible, whereas at lower temperatures the surface leakage current was substantial, and a so-called guard electrode recommendable. (C) 2005 Elsevier Ltd. All rights reserved.

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