Abstract
(K0.95Li0.05) (Ta0.40Nb0.60) O3 (abbreviated as 0.60: KLTN) single crystal has been grown by the top-seeded melt growth method. Dielectric properties in the a- and c-direction have been investigated, and the high anisotropy has been found. ε11=2130, while ε33=371 were determined in the unpoled sample. The piezoelectric constants and electromechanical coupling factors have been determined which are d15=190pC/N, d31=−140pC/N, d33=400pC/N, k15=49.4%, k31=56.2% and k33=75.0%. The crystal orientation dependences of dielectric, piezoelectric and electromechanical coupling properties have been simulated by using the mathematical approach along with phenomenology of the system. These results will be of use for developing high performance lead-free piezoelectric devices.
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