Temperature dependences of the ferroelectric and dielectric properties of high curie temperature PbTiO3–BiScO3–Bi(Zn1/2Zr1/2)O3

The piezoelectric ceramics (1 − x − y)PbTiO3–xBiScO3–yBi(Zn1/2Zr1/2)O3 exhibit greatly enhanced ferroelectric properties above room temperature, between 100 and 200 °C. A strong second harmonic generation (SHG) effect was observed below 200 °C. The highest remanent polarization (∼40 μC/cm2) and lowest coercive field (∼10 kV/cm) were obtained at 200 °C. X-ray diffraction (XRD) analysis was used to investigate the morphotropic phase boundary (MPB) structure of (1 − x − y)PbTiO3–xBiScO3–yBi(Zn1/2Zr1/2)O3 ceramics. Transmission electron microscopy (TEM) results confirm the existence of MPB, where the rhombohedral and tetragonal phases coexist. The results of thermal expansion analysis show a low thermal expansion and stability of this material. The optimal high temperature piezoelectric ceramic is obtained by the composition of 0.05BZZ–0.34BS–0.61PT.

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► Ceramics exhibit enhanced ferroelectric properties with the increase of temperature.
► A strong second harmonic generation effect was observed.
► Transmission electron microscopy results confirm the existence of MPB.