A new ternary ferroelectric crystal of Pb(Y1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3

A ternary piezo-/ferroelectric crystal of 0.22Pb(Y1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.34PbTiO3 (PYN–PMN–PT (22/44/34)) with dimensions of 26 × 26 × 10 mm3 has been grown by the top-seeded solution growth (TSSG) method for the first time with the purpose of exploring new ferroelectric single crystals with high piezoelectric properties and was characterized by structural analysis and electrical measurements. The rhombohedral and tetragonal phases coexist in the as-grown crystals, which belong to the morphotropic phase boundary (MPB) region. The Curie temperature TC and the rhombohedral–tetragonal phase transition temperature TRT reached 125 °C and 90 °C, respectively. The dielectric constant e′, dielectric loss tangent tan δ, piezoelectric coefficient d33, longitudinal electromechanical coupling coefficient k33, remnant polarization Pr and coercive field Ec were found to be 1280, 0.04, 1344 pC N−1, 82%, 21.4 μC cm−2, and 3.4 kV cm−1, for [001]-oriented crystals at room temperature, respectively. These results show that the PYN–PMN–PT (22/44/34) crystals are a promising candidate for use in electromechanical transducer applications.

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