Low-frequency dielectric properties of SrLaAlO4 ceramics

SrLaAlO4 ceramic samples were prepared via solid state reaction method. The low-frequency (20-107 Hz) dielectric properties were investigated in the temperature range from room temperature to 700 °C. It was found that SrLaAlO4 shows intrinsic dielectric behavior with a dielectric constant of 13 in the temperature range below ~300 °C. In the temperature range from 300 °C to 560 °C, the bulk dielectric contribution due to oxygen-vacancy-related polarons dominates the dielectric properties of the samples. However, the dielectric properties are controlled by sample/electrode contacts when the temperature is risen to above 560 °C. Our results indicate that the bulk effect instead of interfacial effect is the main contribution to dielectric loss in the lower temperature range.