Domain reversal in stoichiometric lithium tantalate (LiTaO 3) single crystals prepared by vapor transport equilibrium (VTE) method was studied. Starting from a virgin VTE crystal and using water electrodes, the coercive fields were found to be 1.39±0.01 kV/cm and 1.23±0.01 kV/cm for the first poling and the second poling, respectively, indicating a built-in internal field of 0.08 kV/cm. The spontaneous polarization, P s was 55.2±0.5 μC/cm 2 and the Curie temperature was T c=701±2.5°C. The switching time, t s, exhibits an exponential dependence on the external field, E with activation energy of 10.84±0.22 kV/cm. No domain backswitching was observed. These properties are dramatically different from those of congruent and even near-stoichiometric compositions of lithium tantalate grown by Czhochralski method.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)