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High-performance Pb(Zr1−xTix)O3 (PZT) piezoceramics are urgently desired by the market in view of their expanded operating temperature range, reduced property temperature dependence, and enhanced sensitivity and acoustic power. In this work, we reported a kind of low-cost and high-performance 0.06BiYbO3–0.94Pb(Zr0.48Ti0.52)O3 ternary piezoceramics; the modifying effects of La2O3 on this perovskite system were investigated in terms of the structures, electrical properties, and thermal depolarization behaviors of ceramics. The field-dependent dielectric and conduction properties indicated that there are close correlations among oxygen vacancies (VO), conducting electrons, and intrinsic conduction process. The degradation in ferroelectric properties observed in those samples doped with more than 0.15 wt% of La2O3 indicated that the occupying mechanisms of La3+ changed from the donor substitution for Pb2+ to the isovalent substitution for Bi3+. The thermally depoling micromechanisms of ceramics were revealed from the thermodynamic processes of defect dipoles and intrinsic dipoles within ferroelectric domains. The sample doped with 0.15 wt% of La2O3 shows excellent electrical properties with TC = 387 ℃, d33 = 332 pC/N, TKε = 5.81×10−3 ℃−1, Pr = 20.66 μC/cm2, Td = 356 ℃. The significantly enhanced electrical properties and thermal depolarization temperature benefited from the donor substitution of La3+, decreasing the oxygen vacancy concentration in the lattice and possibly optimizing the ferroelectric domain structure of ceramics.
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