Abstract
Domain reversal in stoichiometric lithium tantalate (LiTaO3) 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±0.01kV∕cm and 1.23±0.01kV∕cm for the first poling and the second poling, respectively, indicating a built-in internal field of 0.08kV∕cm. The spontaneous polarization, Ps was 55.2±0.5μC∕cm2 and the Curie temperature was Tc=701±2.5°C. The switching time, ts, exhibits an exponential dependence on the external field, E with activation energy of 10.84±0.22kV∕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.
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