Current-voltage characteristics of grain boundaries in polycrystalline Sr-doped LaGaO3.
The oxide-ion current across grain boundaries in a polycrystalline LaGaO(3) ceramic doped with 1 mol% Sr(2+) increases non-linearly with the applied dc-bias to present a transition from ohmic to superohmic where the bias exceeds the thermal voltage, verifying that a Schottky-type potential barrier exists at the grain boundary in acceptor-doped LaGaO(3) to limit the internal current.
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA.
Chien-Ting
CT
Chen
Kwanghoon
K
Choi
Sangtae
S
Kim