Charge Properties of Bi-Rich Strontium Bismuth Tantalate Thin Films

Abstract
The thermal behavior of charge properties and the polarization-retention of a Sr0.8Bi2.2Ta2O9 thin film were investigated in a range from room temperature to 558 K. The anomaly caused by the thermally stimulated space charge was observed. The anomaly started at about 425 K and showed a peak at about 525 K. However, the thermal behavior of the charge properties of the film in this temperature range is explained as being in a ferroelectric phase according to the Landau theory.