High‐Temperature Resistance Anomaly at a Strontium Titanate Grain Boundary and Its Correlation with the Grain‐Boundary Faceting–Defaceting Transition

Abstract

A correlation between a grain-boundary structural transition and a change in electrical properties is demonstrated, using a SrTiO3 bicrystalline grain boundary as a model system. A grain-boundary faceting–defaceting transition is seen between 1500 and 1600 °C (the grain-boundary of the bicrystal annealed at 1600 °C for one day is shown in the figure) accompanied by an abrupt change in grain-boundary electrical impedance.