Ferroelectric stability and fatigue mechanism of BNKT ceramics by Nb doping

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2024-07-17 DOI:10.1007/s10832-024-00359-9

Binbin Chen, Yang Hu, Huazhang Zhang, Wen Chen, Jing Zhou

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Abstract

The fatigue behavior of Bi_0.5Na_0.4K_0.1TiO₃-based ceramics depends on the polarity. While the non-ergodic relaxor ceramics have large residual polarization but poor fatigue behavior, the ergodic relaxor ceramics have excellent fatigue resistance but tiny residual polarization. Therefore, obtaining ferroelectric ceramics with high residual polarization and excellent fatigue resistance is challenging due to the trade-off between non-ergodic relaxor and ergodic relaxor. Here, we modulate the free energy barrier by doping relaxant Nb to achieve the coexistence of non-ergodic and ergodic relaxor phases. At 0.6% Nb doping, the residual polarization is large at 2P_r = 49.3 µC/cm², increased to 54.23 µC/cm² after 10² cycles and decreased to 53.04 µC/cm² after 10⁵ cycles, indicating good fatigue resistance behavior. The large residual polarization is due to the metastable ferroelectric state, while the excellent fatigue resistance may be attributed to the field-induced ferroelectric-relaxor phase transition.

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掺杂铌的 BNKT 陶瓷的铁电稳定性和疲劳机理

Bi0.5Na0.4K0.1TiO3 基陶瓷的疲劳行为取决于极性。非极性弛豫陶瓷具有较大的残余极化，但疲劳性能较差；而极性弛豫陶瓷具有出色的抗疲劳性能，但残余极化很小。因此，在非麦角弛豫器和麦角弛豫器之间进行权衡，获得具有高残余极化和优异抗疲劳性能的铁电陶瓷是一项挑战。在这里，我们通过掺杂弛豫剂铌来调节自由能垒，从而实现非极性弛豫相和极性弛豫相的共存。掺杂 0.6% Nb 时，残余极化在 2Pr = 49.3 µC/cm2 时较大，102 次循环后增至 54.23 µC/cm2，105 次循环后降至 53.04 µC/cm2，显示出良好的抗疲劳性能。残余极化大的原因是铁电态变，而出色的抗疲劳性能可能是由于场诱导的铁电-缓释相变。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.