Domain reversal in stoichiometric LiTaO3 prepared by vapor transport equilibration

Tian, L.; Gopalan, Venkatraman; Galambos, Ludwig
November 2004
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4445
Academic Journal
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±0.01 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, Ps was 55.2±0.5 μC/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±0.22 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.


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