This work investigates the effects of lanthanum doping on the crystal structure, surface morphology, dielectric properties, ferroelectric properties, piezoelectric properties, and electromechanical strain properties of lead-free (Bi_0.47Na_0.47Ba_0.06)_1−xLa_xTiO₃ piezoelectric ceramics. All specimens were fabricated by a traditional solid-state reaction method. The results of crystal structure and dielectric properties categorize all specimens as relaxor materials. The results of dielectric properties and ferroelectric properties confirm the nonergodic-to-ergodic transformation as a function of La content. At the phase transition point, the material shows a high electric field-induced strain of 0.4% under an applied electric field of 5 kV/mm. The large electromechanical strain response at low applied field in the 0.02 mol La specimen may contribute to the two synergistic effects. First, the electric field induced the reversible ergodic-ferroelectric phase transition, which can generate the large strain. Second, the nonergodic and ergodic phases coexist at the phase transformation point, which can reduce the driving field by facilitating the growth of ferroelectric domains.

这项工作研究了镧掺杂对无铅（Bi _0.47 Na _0.47 Ba _0.06）_{1- x} La _x TiO ₃的晶体结构，表面形态，介电特性，铁电特性，压电特性和机电应变特性的影响。压电陶瓷。所有样品均通过传统的固态反应方法制备。晶体结构和介电性能的结果将所有样品归类为弛豫材料。介电性质和铁电性质的结果证实了非遍历到遍历转变是La含量的函数。在相变点处，该材料在5 kV / mm的施加电场下显示出0.4％的高电场感应应变。0.02 mol La样品在低外加电场下的大机电应变响应可能有助于这两种协同效应。首先，电场引起可逆的遍历-铁电相变，从而产生大应变。其次，非遍历阶段和遍历阶段在相变点同时存在，