TITLE

Domain reversal in stoichiometric LiTaO3 prepared by vapor transport equilibration

AUTHOR(S)
Tian, L.; Gopalan, Venkatraman; Galambos, Ludwig
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4445
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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±0.01 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.
ACCESSION #
14974953

 

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