Tailoring charge transport in BaTiO3 crystals through dislocation engineering

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-09-16 DOI:10.1111/jace.20147

Ahmad Sayyadi-Shahraki, Till Frömling, Fangping Zhuo

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引用次数: 0

Abstract

Dislocations in oxide ceramics significantly influence their physical properties by creating substantial local strain fields, new electronic states, and space-charge layers. In this study, we investigated the effects of mechanically introduced dislocations on the electrical conductivity of BaTiO₃ single crystals. High-temperature plastic deformation was employed to introduce a high dislocation density with a {100}〈100〉 slip system. Impedance measurements revealed a significant anisotropy in the conductivity due to the presence of oriented dislocation structures. The crystals with dislocation lines aligned parallel to the measurement axis ([001] crystallographic direction) exhibited 16-fold higher conductivity compared to those measured across the dislocations. Compared to the pristine crystals, this means an increase in conductivity when the measurements were carried out parallel to dislocation lines and a decrease in perpendicular measurements. Our study demonstrates that not only ferroelectric properties but also charge transport can be modified by dislocation introduction in BaTiO₃.

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通过位错工程调整 BaTiO3 晶体中的电荷传输

氧化物陶瓷中的位错会产生大量的局部应变场、新的电子态和空间电荷层，从而极大地影响陶瓷的物理性质。在本研究中，我们研究了机械引入位错对 BaTiO3 单晶导电性的影响。研究采用高温塑性变形，在{100}〈100〉滑移系统中引入高位错密度。阻抗测量显示，由于存在定向位错结构，电导率具有显著的各向异性。位错线平行于测量轴（[001]晶体学方向）的晶体的电导率比跨位错测量的电导率高 16 倍。与原始晶体相比，这意味着与位错线平行测量时电导率增加，而垂直测量时电导率降低。我们的研究表明，在 BaTiO3 中引入差排不仅能改变铁电特性，还能改变电荷传输。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.