Growth and characterization of Fe-doped Pb(Zn1/3Nb2/3)O3−PbTiO3 single crystals

Fe-doped 0.955Pb(Zn1/3Nb2/3)O3−0.045PbTiO3 (PZNT4.5) single crystals were grown using a high temperature flux technique and the dielectric, piezoelectric, electromechanical, electrostrictive, and electro-optic properties were characterized. The room temperature dielectric permittivity along the direction after poling was about ∼6000 (5000−7000), increased compared to that of pure PZNT4.5 crystals ∼3000−5000. The Curie temperature (TC) and the rhombohedral to tetragonal phase transition temperature (Tr−t) of doped crystals were about 143 and 92 °C, respectively, more than 20 °C lower than that of the pure crystals. The remnant polarization (Pr) and coercive field (Ec) of oriented doped crystals measured at 1 Hz and 20 kV/cm field were ∼27.3 μC/cm2 and 4.7 kV/cm, respectively, the latter significantly greater than the Ec of the pure crystals ∼3 kV/cm. Piezoelectric coefficients (d33) of oriented doped PZNT4.5 crystals were ∼2500−3000 pC/N, being much higher than that of the pure (1400–2000...

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