Mixed conduction behavior in nanostructured lanthanum gallate

摘要

Electrical conduction in nanostructured 10 mol% Sr- and 15 mol% Mg-doped lanthanum gallate was investigated. The grain boundary conductivity shows mixed ionic and electronic conduction, while the grain conductivity shows ionic conduction. This is attributed to the increase of the contribution of the electron-hole in the grain boundary by the space charge effect. The overall electrical conductivity is gov erned by the grain boundary conductivity such that nanostructured lanthanum gallate becomes a mixed conductor.