The composition / field-induced octahedral tilt, domain switch and improved piezoelectric properties in BF-BT ceramics across phase transition

IF 10.7 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materials Chemistry A Pub Date : 2024-10-14 DOI:10.1039/d4ta03949a

Jinyu Chen, Chao Chen, Chong Zhao, na tu, Yunjing Chen, Nie Xin, Xiaokun Huang, Junming Liu, Xiangping Jiang

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Abstract

To clarify the structural mechanism of high piezoelectric activity of (1-x)BiFeO3-xBaTiO3 ((1-x)BF-xBT) solid solution, the evolution of phase structure and domain configuration and their effects on piezoelectric properties were studied in a wide range of components (0.2 ≤ x ≤ 0.9). XRD refinement results show that with the introduction of BT, the phase structure gradually transforms from rhombohedral (R) to rhombohedral/pseudocubic (R/pC) coexistence and finally to pC, accompanied by the weakening of lattice distortion. The freezing temperature (Tf) of (1-x)BF-xBT decreases with the increment of BT around the morphotropic phase boundary (MPB) (0.3 ≤ x ≤ 0.5). This indicates that the domain structure changes from ferroelectric ordered domains to nanodomains (or polar nanoregions), corresponding to the enhancement of the relaxation state. High piezoelectric properties in 0.7BF-0.3BT are attributed to the unique heterogeneous domain structure and superior domain switching at MPB. The large strain is achieved in 0.6BF-0.4BT, which results from the mutual transformation between relaxor nanodomains and ferroelectric ordered domains.

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成分/磁场诱导的八面体倾斜、畴切换和 BF-BT 陶瓷的压电特性改善（跨相变

为阐明 (1-x)BiFeO3-xBaTiO3 ((1-x)BF-xBT) 固溶体高压电活性的结构机理，研究了其在宽组分范围（0.2 ≤ x ≤ 0.9）内相结构和畴构型的演变及其对压电特性的影响。XRD 精炼结果表明，随着 BT 的引入，相结构逐渐从斜方体（R）转变为斜方体/假立方体（R/pC）共存，最后转变为 pC，同时晶格畸变减弱。(1-x)BF-xBT 的凝固温度（Tf）随着各向形态相边界（MPB）附近 BT 的增加而降低（0.3 ≤ x ≤ 0.5）。这表明畴结构从铁电有序畴变为纳米畴（或极性纳米区域），与弛豫状态的增强相对应。0.7BF-0.3BT 的高压电特性归因于其独特的异质畴结构和 MPB 处卓越的畴切换。0.6BF-0.4BT 实现了大应变，这是弛豫纳米域和铁电有序域之间相互转化的结果。

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来源期刊

Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

19.50

自引率

5.00%

发文量

1892

审稿时长

1.5 months

期刊介绍： The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.