Repolarization processes in lead-free KNN ceramics

Abstract

In this work, we studied the nature of repolarization processes in KNN-0.05Ta ceramics in the temperature range of structural phase transition. We have found the anomalous behavior of reverse dependences ε'(Ε₌), while measuring the response in weak ac-fields in the sample exposed to the constant bias field. Behavior of ε'(Ε₌) was compared with the polarization loops measured in sinusoidal fields of various amplitudes.

Keywords:

• Lead-free ferroelectric ceramics
• repolarization processes
• aging
• dielectric response