Abstract
The temperature dependence of dielectric and piezoelectric properties, electric-field-induced strains of 0.66 Pb(In 1/2Nb 1/2)O 3–0.34 PbTiO 3 single crystals, which were grown directly from melt by using the modified Bridgman technique with the allomeric Pb(Mg 2/3Nb 1/3)O 3–PbTiO 3 seed crystals, were determined as a function of crystallographic orientation with respect to the prototypic (cubic) axes. Ultrahigh piezoelectric response ( d 33∼2000 pC/N, k 33∼94%) and strain levels up to 0.8%, comparable to rhombohedral (1− x)Pb(Mg 2/3Nb 1/3)O 3– xPbTiO 3 and (1− x)Pb(Zn 2/3Nb 1/3)O 3– xPbTiO 3 single crystals, were observed for the 〈0 0 1〉-oriented crystals. Strain levels up to 0.47% and piezoelectric constant d 33∼1600 pC/N could be achieved being related to an electric-field-induced rhombohedral–orthorhombic phase transition for the 〈1 1 0〉-oriented crystals. In addition, high electromechanical coefficients k 33 (∼88%) can be achieved even heating to 110 °C. High T C (∼200 °C), large electromechanical coefficients k 33 (∼94%) and low dielectric loss factor (∼1%), along with large strain make the crystals promising candidates for a wide range of electromechanical transducers.
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