La-driven variation in structure and property of (Bi,La)(Zn0.5Ti0.5)O3-PbTiO3 high-temperature piezoceramics

• Develop a new low-cost Bi-based high temperature piezoceramics with Tc∼580 °C.
• La can drive the changes of phase structure and electrical characterization.
• La-driven compositions exhibit improved electrical properties.
• Thermal stability is closely related to domain type of ferroelectric ceramics.

La-doped 0.3(Bi1−xLax)(Zn0.5Ti0.5)O3-0.7PbTiO3 (BLZT-PT) ceramics with 0 ≤ x ≤ 0.30 was studied. La doping reduced the tetragonality/polar distortion, shifted Curie temperature, changed thermal stability and improved ferro-piezoelectric properties of the ceramics. The sample with optimal composition at x = 0.055 exhibited high Curie temperature of about 580 °C with good piezoelectric properties. This makes BLZT-PT a promising candidate for next-generation of piezoelectric ceramics at high-temperatures.

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