BiFeO3–BaTiO3–(Bi0.5Na0.5)TiO3 协同调节的优质无铅高温压电陶瓷,Journal of Materials Chemistry A

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BiFeO3–BaTiO3–(Bi0.5Na0.5)TiO3 协同调节的优质无铅高温压电陶瓷
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-04-11 , DOI: 10.1039/d3ta00158j
Aiwen Xie ₁ , Mengshan Wang ₂ , Jian Fu ₂ , Zide Yu ₂ , Xinchun Xie ₁ , Ruzhong Zuo ₁

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如何克服压电系数（d ₃₃）与居里温度（T _c）之间的矛盾是高温压电陶瓷实际应用中长期面临的挑战。在这里，我们介绍了一种同时提高0.69Bi _1.02 Fe ₍₁₋_x₎ (Mg _2/3 Nb _1/3 ) _x O ₃ -0.29BaTiO ₃ -0.02(Bi _0.5 Na _0.5 )中的d ₃₃和T _c值的策略TiO ₃ (BF(MN) _x–BT–BNT)通过协同调节菱面体相的晶格畸变和含量、畴异质性和缺陷浓度，组成接近菱面体-拟立方准同晶相界。随着₍ Mg _2/3 Nb 1/3 ₎³⁺含量从^x = _ _{_} _ ^_ _ _ _ 0 到x= 0.003。晶格畸变增加、菱面体相含量减少、畴异质性增强和缺陷浓度降低的协同效应导致压电性显着增强，而晶格畸变增加和菱面体相含量减少之间的竞争效应导致改进的T _c。这些结果为在 BF-BT 基和其他钙钛矿结构压电陶瓷中合成设计理想的高温压电陶瓷提供了一种新策略。

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Superior lead-free high-temperature piezoceramics of BiFeO3–BaTiO3–(Bi0.5Na0.5)TiO3 through cooperative regulation

How to overcome the contradiction between the piezoelectric coefficient (d₃₃) and Curie temperature (T_c) is a long-term challenge for practical applications of high-temperature piezoelectric ceramics. Here, we introduce a strategy to simultaneously enhance d₃₃ and T_c values in 0.69Bi_1.02Fe_(1−x)(Mg_2/3Nb_1/3)_xO₃-0.29BaTiO₃-0.02(Bi_0.5Na_0.5)TiO₃ (BF(MN)_x–BT–BNT) compositions close to the rhombohedral-pseudocubic morphotropic phase boundary by cooperatively regulating the lattice distortion and content of the rhombohedral phase, domain heterogeneity and defect concentration. The d₃₃ and T_c values increase from ∼180 pC N⁻¹ and ∼460 °C to ∼240 pC N⁻¹ and ∼482 °C with increasing (Mg_2/3Nb_1/3)³⁺ content from x = 0 to x = 0.003. The synergistic effect of the increased lattice distortion, decreased rhombohedral phase content, enhanced domain heterogeneity and reduced defect concentration is responsible for the significantly enhanced piezoelectricity, while the competition effect between the increase of the lattice distortion and the decrease of the rhombohedral phase content leads to an improved T_c. These results provide a new strategy for compositionally designing ideal high-temperature piezoelectric ceramics in BF–BT based and other perovskite-structured piezoelectric ceramics.

更新日期：2023-04-11

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