Ultrasound pulse-echo Study of KLT

The ultrasound pulse-echo technique is employed to investigate the phase transitions of ferroelectric crystal KLT(K_1-xLi_iTaO₃). These transitions are initiated by gradually heating and cooling the crystal while applying a direct current (DC) electric field. The primary objective of this study is to generate graphical representations of the phase transitions as ultrasonic pulses pass through the crystal during temperature changes, and to compare the results under varying DC fields to highlight the material's ferroelectric properties.

A homodyne phase detector is used to precisely measure the phase difference between the transmitted and received ultrasound pulses. Preliminary data suggests that the electric field significantly impacts the phase transitions. However, additional data, especially at higher voltages, is needed to confirm this observation.