Correlation between phase, microstructure and electrical properties of KNN-modified BNT-BT lead free ceramics

IF 2.6 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of the Australian Ceramic Society Pub Date : 2026-01-23 DOI:10.1007/s41779-026-01348-7

Yan Mu, Junjun Wang, Bingsen Wang, Yufang Jiao, Jian He, Meng Liu, Che Sun, Shaoyang Yuan, Danqing Liu, Wenlong Yang, Linjing Liu, Fengmin Wu

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Abstract

To enhance the piezoelectric performance of the lead-free Bi_0.5Na_0.5TiO₃-BaTiO₃ (BNT-BT) system, we introduced K_0.5Na_0.5NbO₃ (KNN) via synergistic composition modulation. A series of (0.94-x)BNT-0.06BT-xKNN (x = 0.01–0.04) ceramics were synthesized using a solid-state reaction method. The composition with x = 0.02 exhibited optimal performance, achieving a significantly improved piezoelectric coefficient (d₃₃ = 115 pC/N) and a high depolarization temperature (T_d = 138 °C). Comprehensive structural and electrical characterizations revealed that these enhancements originate from KNN-induced modifications, including the coexistence of rhombohedral and tetragonal phases, refined grain morphology, and optimized domain dynamics. This work demonstrates that KNN modification is an effective strategy for tailoring the functional properties of BNT-BT-based ceramics, positioning the optimized composition as a competitive lead-free piezoelectric candidate for advanced electromechanical applications.

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knn改性BNT-BT无铅陶瓷的相、微观结构与电性能的关系

为了提高无铅Bi0.5Na0.5TiO3-BaTiO3 （BNT-BT）体系的压电性能，我们通过协同成分调制引入了K0.5Na0.5NbO3 （KNN）。采用固相反应法制备了一系列（0.94-x）BNT-0.06BT-xKNN （x = 0.01-0.04）陶瓷。x = 0.02的复合材料表现出最佳的性能，显著提高了压电系数（d₃₃= 115 pC/N）和高退极化温度（Td = 138℃）。综合结构和电学表征表明，这些增强源于knn诱导的改性，包括菱形和四方相的共存、细化的晶粒形貌和优化的畴动力学。这项工作表明，KNN改性是定制bnt - bt基陶瓷功能特性的有效策略，将优化的成分定位为先进机电应用中具有竞争力的无铅压电候选材料。

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来源期刊

Journal of the Australian Ceramic Society Materials Science-Materials Chemistry

CiteScore

3.70

自引率

5.30%

发文量

123

期刊介绍： Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted