The impact of phase structure on piezoelectric performances of <001> textured Na_0.5Bi_0.5TiO₃ (NBT) based lead-free ceramics was studied, including 0.88NBT-0.08K_0.5Bi_0.5TiO₃-0.04BaTiO₃ (88NBT) with morphotropic phase boundary (MPB) composition and 0.90NBT-0.07K_0.5Bi_0.5TiO₃-0.03BaTiO₃ (90NBT) with rhombohedral phase. Both textured ceramics exhibit a high Lotgering factor, being on the order of f~96%. The piezoelectric coefficients of the textured 88NBT and 90NBT ceramics are increased by 20% and 60%, respectively, comparing to their randomly oriented ceramics. The piezoelectric enhancement of 90NBT textured ceramic is three times higher than 88NBT, revealing the phase structure plays a significant role in enhancing the piezoelectric performances of textured ceramics. Of particular significance is that the 90NBT textured ceramic exhibits almost hysteresis-free strain behavior. The enhanced piezoelectric property with minimal strain hysteresis is attributed to the <001> poled rhombohedral engineered domain configuration.

中文翻译：

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相结构对织构无铅陶瓷压电性能的影响

研究了相结构对<001>织构化Na _0.5 Bi _0.5 TiO ₃（NBT）基无铅陶瓷的压电性能的影响，包括0.88NBT-0.08K _0.5 Bi _0.5 TiO ₃ -0.04BaTiO ₃（88NBT）相边界（MPB）成分和0.90NBT-0.07K _0.5 Bi _0.5 TiO ₃ -0.03BaTiO ₃（90NBT）具有菱面体相。两种带纹理的陶瓷都具有很高的洛格因数，约为f〜96％。与随机取向的陶瓷相比，纹理化的88NBT和90NBT陶瓷的压电系数分别增加了20％和60％。90NBT质感陶瓷的压电增强作用是88NBT的三倍，表明相结构在增强质感陶瓷的压电性能中起着重要作用。特别重要的是90NBT织纹陶瓷表现出几乎无磁滞的应变行为。具有最小应变滞后的增强压电特性归因于<001>极化菱形体工程区域。