Tetragonal phase (1–x)(0.875Bi_0.5Na_0.5TiO₃–0.125BaTiO₃)–xBi(Mg_0.5Ti_0.5)O₃ lead-free ferroelectrics were designed and fabricated by a conventional solid state route. All the specimens exhibit a tetragonal perovskite structure, and undergo a phase evolution from ferroelectric P4mm to antiferroelectric relaxor P4bm as the BMT addition increases. The critical composition x = 0.04 makes a bridge between the both tetragonal phases, and gives a large field-induced strain of 0.30% and an adequately-large electrostrictive coefficient Q₃₃ of 0.0254 m⁴/C². To be highlighted, the field-induce strain of the composition x = 0.04 shows an almost constant value over the temperature range of 18–100 °C, illustrating a temperature-insensitive behavior, which could be attributed to the widened gap between T_R–E and T_F–R. The temperature-insensitive large strain of the tetragonal BNT–BT–BMT composition give a promising potential for application in precision position actuators.

通过常规固态路线设计和制造了四方相（1-x）（0.875Bi _0.5 Na _0.5 TiO ₃ –0.125BaTiO ₃）-xBi（Mg _0.5 Ti _0.5）O ₃无铅铁电体。所有样品均表现出四方钙钛矿结构，并且随着BMT添加量的增加，经历了从铁电P4mm到反铁电弛豫器P4bm的相变。临界组成x  = 0.04在两个四方相之间架起一座桥梁，并产生0.30％的大场致应变和0.0254 m ⁴ / C ²的足够大的电致伸缩系数Q ₃₃。需要强调的是，成分x = 0.04的场致应变在18–100°C的温度范围内显示几乎恒定的值，说明温度不敏感的行为，这可能归因于T _{R– E}和T _F–R。四方BNT–BT–BMT成分对温度不敏感的大应变为在精密位置执行器中的应用提供了广阔的前景。