Enhanced piezoelectric performance of donor La3+-doped BiFeO3–BaTiO3 lead-free piezoceramics

Lead-free 0.70Bi1.03FeO3-0.30Ba(1-x)LaxTiO3 piezoelectric ceramics (with x = 0.000, 0.005, 0.010, 0.015 and 0.035 abbreviated as 0.0BaLa, 0.5BaLa, 1.0BaLa, 1.5BaLa and 3.5BaLa) were prepared through the conventional solid-state reaction route followed by water quenching process. The X-ray diffraction profile shows that the substitution of Ba2+ = 1.61 Å with a donor ion, La3+ = 1.36 Å, has a profound impact on the crystal symmetry as results the...