Structure distortion enhanced electrical performances of Na0.25K0.25Bi2.5Nb2O9-based high-temperature piezoceramics

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-03 DOI:10.1016/j.ceramint.2024.10.022

Mengxue Zhang, Xinchun Xie, Aiwen Xie, Yi Zhang, Liqiang Liu, Xin Gao, Ruzhong Zuo

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引用次数: 0

Abstract

Na_0.25K_0.25Bi_2.5Nb₂O₉-based piezoelectric ceramics are potential candidates for high-temperature applications where improving piezoelectric properties is an urgent issue. In this work, significantly improved piezoelectric properties and thermal stability of Na_0.25K_0.25Bi_2.5-xCe_xNb_2-yW_yO₉ (abbreviated NKB_2.5-xC_xN_2-yW_y, x = 0.03, y = 0.01, y = 0.03, y = 0.05) ceramics were obtained through Ce and W co-doping and using a traditional solid-state technique. The optimal composition of NaKBi_2.47Ce_0.03Nb_1.99W_0.01O₉ exhibits a large piezoelectric coefficient d₃₃ of 23.1 pC/N, maintains a high Curie temperature T_c of 690 °C, and a low tanδ of 0.006. The increase of d₃₃ may be attributed to the structure distortion, the micro-sized domains, and the high-density domain walls. More importantly, its d₃₃ value maintains 86 % of the initial value after being annealed at 650 °C for 2 h, whereas only 65 % for the undoped sample under the same conditions, indicating an obviously improved thermal stability. This work provides a new idea for improving piezoelectric properties and thermal stability of Na_0.25K_0.25Bi_2.5Nb₂O₉-based piezoelectric ceramics.

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结构畸变增强 Na0.25K0.25Bi2.5Nb2O9 基高温压电陶瓷的电气性能

基于 Na0.25K0.25Bi2.5Nb2O9 的压电陶瓷是高温应用的潜在候选材料，在高温应用中，提高压电特性是一个迫切的问题。在这项工作中，通过 Ce 和 W 共掺杂，并采用传统的固态技术，获得了压电性能和热稳定性明显改善的 Na0.25K0.25Bi2.5-xCexNb2-yWyO9（缩写为 NKB2.5-xCxN2-yWy，x = 0.03，y = 0.01，y = 0.03，y = 0.05）陶瓷。NaKBi2.47Ce0.03Nb1.99W0.01O9 的最佳组成显示出 23.1 pC/N 的大压电系数 d33，保持了 690 °C 的高居里温度 Tc 和 0.006 的低 tanδ。d33 值的增加可能归因于结构变形、微小畴和高密度畴壁。更重要的是，在 650 °C 下退火 2 小时后，其 d33 值保持在初始值的 86%，而相同条件下未掺杂样品的 d33 值仅为 65%，这表明其热稳定性得到了明显改善。这项工作为改善 Na0.25K0.25Bi2.5Nb2O9 基压电陶瓷的压电特性和热稳定性提供了新思路。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.