Temperature dependence of dielectric properties and domain structure of (K,Na)(Nb,Ta)O₃ single crystal

Abstract

In this work, the influence of temperature on phase structure, dielectric property and domain structure of (K,Na)(Nb,Ta)O₃ (KNNT) crystal from 20 to 200 °C was studied. The irreversible domain wall motion of single crystal is strongest at phase transition temperature by Rayleigh analysis of dielectric properties. The domain structure in the heating and cooling process of single crystal was observed by means of piezoelectricity microscope. The domain structure changed obviously with temperature and the domain structure change is particularly prominent at the phase transition temperature.

Keywords:

• (K,Na)(Nb,Ta)O₃ crystal
• dielectric
• domain evolution
• phase transitions

Additional information

Funding

This work was supported by the Natural Science Foundation of Heilongjiang Province under Grant No. E2018049, the National Natural Science Foundation of China under Grant No. 51402075.