Semiconductive flexoelectric piezoelectric metamaterials with strong electromechanical response

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-06-10 DOI:10.1007/s40843-025-3421-2

Dongxia Tian (, ), Baoju Xia (, ), Yagang Qi (, ), Xiongxin Guo (, ), Xu Yang (, ), Xinnan Shi (, ), Baojin Chu (, )

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Abstract

Piezoelectric materials are widely utilized in sensors, actuators, and transducers for electro-mechanical conversion. Conventional materials have limited piezoelectric response (piezoelectric coefficient d₃₃ < 4000 pC N⁻¹), as well as a mutual restriction between properties and working temperature. Our research demonstrates that the limitation and restriction can be removed by designing piezoelectric metamaterials based on flexoelectricity. We enhance the flexoelectric response of BaTiO₃ ceramics by 25 times compared with the highest reported results via reduction sintering. The BaTiO₃ piezoelectric metamaterials exhibit a large effective d₃₃ > 20000 pC N⁻¹ and no depoling above Curie temperature. The giant μ_eff is generated by spontaneously polarized surface layers and a negative capacitance amplification effect, caused by the defect inhomogeneity formed during sintering. These findings open up new possibilities for designing high-performance piezoelectric materials with extended working temperatures.

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具有强机电响应的半导体柔性压电材料

压电材料广泛应用于传感器、执行器和机电转换换能器中。传统材料具有有限的压电响应（压电系数d33 <； 4000 pC N−1），以及性能和工作温度之间的相互制约。我们的研究表明，可以通过设计基于柔性电的压电超材料来消除这种限制和限制。我们将BaTiO3陶瓷的挠曲电响应提高了25倍，与目前报道的还原烧结的最高结果相比。BaTiO3压电材料具有较大的有效d33 >； 20000 pcn−1，且在居里温度以上不脱极。巨大μeff是由自发极化的表面层和负电容放大效应产生的，这是由于烧结过程中形成的缺陷不均匀性造成的。这些发现为设计具有扩展工作温度的高性能压电材料开辟了新的可能性。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.