journal article·2022-07

Isolated‐Oxygen‐Vacancy Hardening in Lead‐Free Piezoelectrics

Yi‐Xuan Liu, Wanbo Qu, Hao‐Cheng Thong, Yang Zhang, Yunfan Zhang, Fang‐Zhou Yao, Trong Nghia Nguyen, Jia‐Wang Li, Mao‐Hua Zhang, Jing‐Feng Li, Bing Han, Wen Gong, Haijun Wu, Chaofeng Wu, Ben Xu, Ke Wang

Advanced Materials· Volume 34· Issue 29
Publisher page

Abstract

Abstract Defect engineering is a well‐established approach to customize the functionalities of perovskite oxides. In demanding high‐power applications of piezoelectric materials, acceptor doping serves as the state‐of‐the‐art hardening approach, but inevitably deteriorates the electromechanical properties. Here, a new hardening effect associated with isolated oxygen vacancies for achieving well‐balanced performances is proposed. Guided by theoretical design, a well‐balanced performance of mechanical quality factor (Qm) and piezoelectric coefficient (d33) is achieved in lead‐free potassium sodium niobate ceramics, where Qm increases by over 60% while d33 remains almost unchanged. By atomic‐scale Z‐contrast imaging, hysteresis measurement, and quantitative piezoresponse force microscopy analysis, it is revealed that the improved Qm results from the inhibition of both extrinsic and intrinsic losses while the unchanged d33 is associated with the polarization contributions being retained. More encouragingly, the hardening effect shows exceptional stability with increasing vibration velocity, offering potential in material design for practical high‐power applications such as pharmaceutical extraction and ultrasonic osteotomes.
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Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Electronic and Structural Properties of Oxides · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 P. R. China

Instrumental Analysis Center of Xi'an Jiaotong University Xi'an Jiaotong University Xi'an 710049 China

Department of Orthodontics Cranial‐Facial Growth and Development Center Peking University School and Hospital of Stomatology National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials Beijing 100081 P. R. China

Advanced Ceramic Materials & Devices Research Center Yangtze Delta Region Institute of Tsinghua University Jiaxing 314006 P. R. China

Department of Materials and Earth Sciences Technical University of Darmstadt 64287 Darmstadt Germany

Wuzhen Laboratory Jiaxing 314500 P. R. China

Tongxiang Tsingfeng Technology Co., Ltd. Jiaxing 314500 P. R. China

Graduate School China Academy of Engineering Physics Beijing 100193 P. R. China

Funding

National Key Research and Development Program of China · Natural Science Foundation of Beijing Municipality

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