High-field strain and its temperature stability of (1–x) K_0.48Na_0.52Nb_0.96Ta_0.04O₃-xBaZrO₃+8%MnO+3%ZrO₂ (in mole, KNNT-xBZ+8Mn) ceramics sintered in reducing atmosphere are improved simultaneously via defect design in A and B site. There is a conducting type transition from n-type to p-type at x = 0.07. The BaZrO₃ dopant not only induces the increase of defects (${\text{Zr}}_{\text{Nb}}^{\prime }$, ${\text{Ba}}_{\text{Na}}^{·}$, ${\text{Ba}}_{\mathrm{K}}^{·}$) concentration, but also results in the increase of defect (${\text{Mn}}_{\text{Nb}}^{‴}$) concentration, because more Mn ions as +2 oxidation state in ceramics is triggered by BaZrO₃ doping modification. Defect dipoles (${\text{Mn}}_{\text{Nb}}^{‴}{\mathrm{V}}_{\mathrm{o}}^{··}$, ${\text{Zr}}_{\text{Nb}}^{\prime }$-${\mathrm{V}}_{\mathrm{o}}^{··}$, ${\text{Ba}}_{\text{Na}}^{·}$-${\mathrm{V}}_{\text{Na}}^{\prime }$, ${\text{Ba}}_{\mathrm{K}}^{·}$-${\mathrm{V}}_{\mathrm{K}}^{\prime }$) in poled and aged ceramics enhance the reversibility of the non-180° domains switching, which increases the high-field strain of KNNT-xBZ+8Mn ceramics. The reversibility of non-180° domain switching can be preserved to high temperature due to stable defect dipoles (${\text{Ba}}_{\text{Na}}^{·}$-${\mathrm{V}}_{\text{Na}}^{\prime }$, ${\text{Ba}}_{\mathrm{K}}^{·}$-${\mathrm{V}}_{\mathrm{K}}^{\prime }$) in A-site. The KNNT-xBZ+8Mn ceramics at x = 0.07 show the largest high-field strain coefficient (543 pm/V@20 kV/cm) and the highest temperature stability (125 °C). The KNNT-xBZ+8Mn ceramic is a lead-free material with great potential to be applied in the fabrication of multilayer ceramic actuators with Ni inner electrodes in the future.

(1– x ) K _0.48 Na _0.52 Nb _0.96 Ta _0.04 O ₃ - x BaZrO ₃ +8%MnO+3%ZrO ₂ (以摩尔计，KNNT- x BZ+8Mn)陶瓷烧结体的高场应变及其温度稳定性通过A、B点的缺陷设计，同时改善了还原气氛的影响。当x = 0.07时，存在从 n 型到 p 型的导电类型转变 。BaZrO ₃掺杂剂不仅会导致缺陷的增加（${\text{锆}}_{\text{铌}}^{\prime }$,${\text{巴}}_{\text{钠}}^{·}$,${\text{巴}}_{\mathrm{K}}^{·}$）浓度，但也会导致缺陷（${\text{锰}}_{\text{铌}}^{‴}$）浓度，因为陶瓷中更多的+2氧化态Mn离子是由BaZrO ₃掺杂改性引发的。缺陷偶极子 (${\text{锰}}_{\text{铌}}^{‴}{\mathrm{V}}_{\mathrm{哦}}^{··}$,${\text{锆}}_{\text{铌}}^{\prime }$-${\mathrm{V}}_{\mathrm{哦}}^{··}$,${\text{巴}}_{\text{钠}}^{·}$-${\mathrm{V}}_{\text{钠}}^{\prime }$,${\text{巴}}_{\mathrm{K}}^{·}$-${\mathrm{V}}_{\mathrm{K}}^{\prime }$）在极化和老化陶瓷中增强了非180°域切换的可逆性，从而增加了KNNT- x BZ+8Mn陶瓷的高场应变。由于稳定的缺陷偶极子（${\text{巴}}_{\text{钠}}^{·}$-${\mathrm{V}}_{\text{钠}}^{\prime }$,${\text{巴}}_{\mathrm{K}}^{·}$-${\mathrm{V}}_{\mathrm{K}}^{\prime }$）在A站点。x = 0.07 时的KNNT- x BZ+8Mn 陶瓷 表现出最大的高场应变系数（543 pm/V@20 kV/cm）和最高的温度稳定性（125 °C）。KNNT- x BZ+8Mn陶瓷是一种无铅材料，在未来具有镍内电极的多层陶瓷执行器的制造中具有巨大的应用潜力。