March 6-11, 2016
Field-induced electronic conduction is widely recognised in (a) materials whose resistance is dominated by interfacial Schottky barriers and (b) thin films that exhibit high field-induced filamentary conduction. A third category of (low) field-sensitive conduction occurs in bulk oxide ceramics that show enhanced hole conduction if they are acceptor-doped, but reduced n-type conduction if they are donor-doped. Examples in these two categories are acceptor-doped titanate perovskites  and rutile that is slightly oxygen-deficient . More recently, reversible, field-induced electronic conduction has been demonstrated in yttria-doped zirconia ceramics  and a reversible, insulator-metal transition in Ca-doped BiFeO3 ceramics .
A survey of these phenomena and their characteristics will be presented and possible mechanisms, involving redox activity of oxygen in the oxide ceramic structures, discussed. Possible implications in a range of fields, including dielectric breakdown, lithium battery cathodes, memristive switching and insulator-metal transitions will be highlighted for discussion.
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