Time dependence of the asymmetric resistance of polycrystalline β″-alumina

✍ Scribed by M.W. Breiter; B. Dunn

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 498 KB
• Volume: 26
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(81)85100-6

✦ Synopsis

Akutract

-The time depcndena of the asymmetric dc resistance for certain polycrystalline /I"-alumina tubes was investigated by cyclic voltammetry and current pulse techniques. Various compositions were studied as representative of the different types of behavior; asymmetric rcaistanoe with time dependence (9.6 y0 Na,O, 0.75 % Li,O), asymmetric resistance without time dependence (8.6 % Na,O, 1% MgO, 0.5 "/, Li,O), and symmetric rcaistancz (8.85% Na,O. 0.75% Li,O). Asymmetry appears to be canacd by the anodic modification of an initially present film to a thin passivating film of Na,O. Film conversion occurs more slowly for the first mats&l.