In-situ measurements by impedance spectroscopy of highly resistive alpha-alumina
2006 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 48, no 1, 243-257 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 48, no 1, 243-257 p.
aluminium oxide; impedance spectroscopy; ionic conductivity; high temperature corrosion; HIGH-TEMPERATURE OXIDATION; SINGLE-CRYSTAL ALUMINA; ELECTRICAL CONDUCTIVITY; SELF-DIFFUSION; OXIDE-FILMS; POLARIZATION; ALPHA-AL2O3; STEEL
IdentifiersURN: urn:nbn:se:kth:diva-6899DOI: 10.1016/j.corsci.2004.11.027ISI: 000234618800017ScopusID: 2-s2.0-28044446986OAI: oai:DiVA.org:kth-6899DiVA: diva2:11743
QC 201008252007-03-152007-03-152010-08-25Bibliographically approved