Oxygen vacancy-induced strengthening and toughening in (K,Na)NbO3-based piezoceramics revealed via nanoindentation

IF 15.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Zhidong Zhang, Bin Yang, Longyu Chen, Zaoli Zhang, Jinming Guo
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引用次数: 0

Abstract

Dislocations are emerging as a pivotal factor for tailoring ceramics’ functional and mechanical properties. The introduction of point defects, notably oxygen vacancies, is unavoidable during the conventional sintering process in polycrystalline ceramics. Understanding the interplay between dislocations and oxygen vacancies is necessary for its profound implications. This work implements an innovative approach to regulate the dislocation-based incipient plasticity and creep behavior in (K0.5Na0.5)NbO3-based ceramics through oxygen vacancy engineering via CuO “hard” doping. Nanoindentation pop-in tests reveal that increasing oxygen vacancy concentrations significantly promotes the nucleation and activation of dislocations. Theoretical calculations based on density functional theory further corroborate that oxygen vacancies contribute to a decrease in Peierls stress and total misfit energy, facilitating dislocation nucleation and activation. Nanoindentation hardness and creep behavior demonstrate that oxygen vacancy impedes dislocation mobility due to solute strengthening and pinning effects. The effect of oxygen vacancies is elucidated through diverse mechanisms related to the interaction between dislocations and oxygen vacancies at different stages. This oxygen vacancy-induced strengthening and toughening strategy displays a significant potential to improve the mechanical properties of piezoelectric ceramics, while still maintaining high electrical performance.

Abstract Image

纳米压痕研究(K,Na) nbo3基压电陶瓷中氧空位诱导的强化和增韧
位错是决定陶瓷功能和力学性能的关键因素。在多晶陶瓷的常规烧结过程中,引入点缺陷,特别是氧空位,是不可避免的。理解位错和氧空位之间的相互作用对于其深远意义是必要的。本研究通过氧空位工程,通过CuO“硬”掺杂,实现了一种创新的方法来调节(K0.5Na0.5) nbo3基陶瓷的位错初始塑性和蠕变行为。纳米压痕突入试验表明,增加氧空位浓度可显著促进位错的成核和激活。基于密度泛函理论的理论计算进一步证实了氧空位有助于降低Peierls应力和总失配能,促进位错成核和活化。纳米压痕硬度和蠕变行为表明,由于溶质强化和钉钉效应,氧空位阻碍了位错的迁移。氧空位的影响是通过位错与氧空位在不同阶段相互作用的多种机制来阐明的。这种氧空位诱导的强化和增韧策略在改善压电陶瓷的机械性能的同时仍保持较高的电性能,显示出巨大的潜力。
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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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