Mechanical properties and multi-field ferroelastic response of Nb/Mn Co-doped CaBi4Ti4O15 high-temperature ferroelectric ceramics

IF 5.1 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Jiageng Xu , Shaoxiong Xie , Yongjie Liu , Xiandong zhou , Qingyuan Wang , Jianguo Zhu
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Abstract

CaBi4Ti4O15 (CBT) ceramics are promising piezoelectric materials that have been widely studied for high-temperature applications. Despite significant advancements in the electrical performance of CBT ceramics, the understanding of their mechanical behaviors remains limited, which is unfavorable for designing ceramics with high stability and reliability during high-temperature service. This work investigated the mechanical properties and fracture behaviors of Nb/Mn co-doped CaBi4Ti4O15 (CBTNM) with various doping levels, focusing on stress-strain responses and ferroelastic deformation behaviors under uniaxial compression and multi-field coupling conditions. HRTEM analysis reveals small-scale layered domain wall structures on the surface of plate-like grains. The fracture and compressive strengths of CBTNM ceramics initially decrease and then increase with an increase in doping content, and the underlying mechanisms are related to grain size, defects, and densification. CBTNM ceramics exhibit nonlinear stress-strain responses due to ferroelastic deformation under compressive loading, and the resultant irreversible domain switching strain increases with an increase in doping content, while poling can further increase the residual strain. Under multi-field loading conditions, CBTNM ceramics undergo more ferroelastic deformation events and exhibit larger residual strain. The micro-cracks, pores, complicated fracture modes, and degraded fracture surfaces with fragmental and rough features are mainly responsible for the lower elastic modulus and inferior mechanical response. This work enhances our understanding of the mechanical behaviors of high-temperature piezoelectric ceramics and provides guidance for designing high-performance piezoelectric materials for complex environmental applications.
掺杂 Nb/Mn Co 的 CaBi4Ti4O15 高温铁电陶瓷的力学性能和多场铁弹性响应
CaBi4Ti4O15 (CBT) 陶瓷是一种很有前途的压电材料,在高温应用领域得到了广泛的研究。尽管 CBT 陶瓷在电气性能方面取得了重大进展,但对其机械行为的了解仍然有限,这不利于设计在高温条件下具有高稳定性和可靠性的陶瓷。这项工作研究了不同掺杂水平的 Nb/Mn 共掺杂 CaBi4Ti4O15(CBTNM)的力学性能和断裂行为,重点是单轴压缩和多场耦合条件下的应力应变响应和铁弹性变形行为。HRTEM 分析揭示了板状晶粒表面的小尺度分层畴壁结构。随着掺杂含量的增加,CBTNM 陶瓷的断裂强度和抗压强度先降低后升高,其基本机制与晶粒尺寸、缺陷和致密化有关。CBTNM 陶瓷在压缩加载下由于铁弹性变形而表现出非线性应力-应变响应,由此产生的不可逆畴切换应变随着掺杂含量的增加而增加,而极化会进一步增加残余应变。在多场加载条件下,CBTNM 陶瓷会发生更多的铁弹性变形事件,表现出更大的残余应变。微裂纹、孔隙、复杂的断裂模式以及具有碎裂和粗糙特征的退化断裂面是造成弹性模量较低和机械响应较差的主要原因。这项研究加深了我们对高温压电陶瓷机械行为的理解,为设计用于复杂环境应用的高性能压电材料提供了指导。
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来源期刊
Ceramics International
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.
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