We present a systematic study of the switching and stabilization times of 180° domains in congruent z-cut LiNbO3 and LiTaO3 crystals. The domains were reversed by the application of an electric field, and the kinetics studied for the first reversal of a virgin crystal (denoted as forward poling, or, f) and the second reversal back to its original state (denoted as reverse poling, or, r) at room temperature. The switching time, t shows an exponential behavior with field as t = t0exp[δ/(E ± E-int)], where the - sign in the exponential is for forward poling, and + sign for reverse poling. The internal field, E-int, parallel to the ferroelectric polarization in a virgin crystal, was measured as 41.2 kV/cm for LiTaO3 and 22.2 kV/cm for LiNbO3. We also showed that there exists a minimum pulse width of the applied field below which the 180° domains created by the field are unstable and show reversible wall motion. This stabilization time was measured as 1.4-2 s for LiTaO3 and only 10-30 ms for LiNbO3 in forward poling geometry. We present evidence that the internal field and the domain stabilization mechanisms are correlated.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry