Dielectric and piezoelectric properties of high curie temperature 0.63Bi(Mg1/2Ti1/2)O3–0.37PbTiO3 single crystals with morphotropic phase boundary composition

Highlights

•Novel perovskite ferroelectric 0.63BMT–0.37PT single crystals near the morphotropic phase boundary were successfully grown by a self-flux method.

•The 0.63BMT–0.37PT single crystals presented high Curie temperature (T_c) about 460 °C and a rhombohedral to tetragonal phase transition temperature (Tr-t) 249 °C.

•The d₃₃ of 0.63BMT–0.37PT single crystals is 320pC/N, much higher than that of ceramics with the same composition (220pC/N).

Novel perovskite ferroelectric 0.63Bi(Mg_1/2Ti_1/2)O₃–0.37PbTiO₃ (0.63BMT–0.37PT) single crystals with a composition around the morphotropic phase boundary (MPB) were successfully grown by a self-flux method. They presented Curie temperature (T_c) about 460 °C and a rhombohedral to tetragonal phase transition temperature (Tr-t) 249 °C. The piezoelectric constant d₃₃ for (001) oriented 0.63BMT–0.37PT single crystals reached 320pC/N, which was higher than that (208pC/N) in the tetragonal phase 0.38BMT–0.62PT crystals. The large piezoelectric constant d₃₃ and high T_c make BMT–PT single crystals promising candidates used for the next generation of high performance and high temperature actuators and transducers.

Keywords:  A. BMT-PT single crystals;  B. Crystal growth;  D. Dielectric properties;  D. Piezoelectric properties

Source: Sciencedirect

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