温度稳定性优异的K0.5Na0.5NbO3基压电陶瓷及其1-3型换能器

doi:10.15541/jim20240422

无机材料学报 ›› 2025, Vol. 40 ›› Issue (3): 297-304.DOI: 10.15541/jim20240422

所属专题：【信息功能】介电、铁电、压电材料（202506）

温度稳定性优异的K_0.5Na_0.5NbO₃基压电陶瓷及其1-3型换能器

高天宇¹(), 刘东¹, 赵思雪²(), 邓伟³, 张波萍¹, 朱立峰¹()

1.北京科技大学材料科学与工程学院, 北京 100083
2.北京建筑材料科学研究总院, 北京 100041
3.佛山(华南)新材料研究院, 佛山 528200

收稿日期:2024-10-08 修回日期:2024-10-29 出版日期:2025-03-20 网络出版日期:2025-03-12
通讯作者: 赵思雪, 高级工程师. E-mail: zhaosixue@whut.edu.cn;
朱立峰, 副教授. E-mail: zhu@ustb.edu.cn
作者简介:高天宇(2002-), 男, 硕士研究生. E-mail:m202420440@xs.ustb.edu.cn
基金资助:
国家自然科学基金(52272104);北京科技大学青年教师学科交叉研究滚动项目(FRF-IDRY-GD23-001)

K_0.5Na_0.5NbO₃-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer

GAO Tianyu¹(), LIU Dong¹, ZHAO Sixue²(), DENG Wei³, ZHANG Boping¹, ZHU Lifeng¹()

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Beijing Building Materials Academy of Sciences Research, Beijing 100041, China
3. Foshan (Southern China) Institute for New Materials, Foshan 528200, China

Received:2024-10-08 Revised:2024-10-29 Published:2025-03-20 Online:2025-03-12
Contact: ZHAO Sixue, senior engineer. E-mail: zhaosixue@whut.edu.cn;
ZHU Lifeng, associate professor. E-mail: zhu@ustb.edu.cn
About author:GAO Tianyu (2002-), male, Master candidate. E-mail: m202420440@xs.ustb.edu.cn
Supported by:
National Natural Science Foundation of China(52272104);Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for Central Universities)(FRF-IDRY-GD23-001)

摘要/Abstract

摘要：

铌酸钾钠(K_0.5Na_0.5NbO₃, KNN)基压电陶瓷由于具有优异的压电系数(Piezoelectric Coefficient, d₃₃)和高居里温度(Curie Temperature, T_C), 被认为是最有潜力取代铅基压电陶瓷的无铅压电陶瓷体系。然而, 相比铅基压电陶瓷体系, KNN基陶瓷体系的d₃₃温度稳定性较差, 影响了其实际应用。针对该问题, 本研究采用常规固相烧结法和织构工程设计制备了具有单一四方相(T相)的(K_0.5Na_0.5)_0.96Li_0.04(Nb_0.95Sb_0.05)O₃-(Bi_0.5Na_0.5)ZrO₃(KNLNS-BNZ)织构压电陶瓷。研究发现: 相比非织构陶瓷, KNLNS-BNZ织构陶瓷不仅具有更优异的压电系数(d₃₃=256 pC∙N^-1)和纵向机电耦合系数(Longitudinal Electromechanical Coupling Coefficient, k₃₃=34%), 而且具有更优良的d₃₃和k₃₃温度稳定性。在温度范围25~250 ℃之间, KNLNS-BNZ织构陶瓷d₃₃和k₃₃的变化率分别为12%和4%。此外, 本工作制备并研究了由KNLNS-BNZ织构陶瓷和环氧树脂组成的1-3型换能器。该1-3型换能器不仅具有大带宽(BW=61.2%)和优良的信号强度(f_c=1 MHz), 而且具有良好的温度稳定性。当测量温度升高到100 ℃时, 其带宽BW和中心频率f_c分别为58.7%和0.94 MHz, 与室温下的测量结果相比其变化率分别为4%和6%。以上结果表明, KNLNS-BNZ无铅压电陶瓷具有良好的压电性能和优异的温度稳定性, 并且基于此制备的1-3型换能器可为新型无铅压电陶瓷的实际应用提供参考。

关键词: 铌酸钾钠, 织构陶瓷, 压电性能, 换能器

Abstract:

Potassium-sodium niobate (K_0.5Na_0.5NbO₃) based piezoelectric ceramics are considered the most potential lead-free piezoelectric ceramics due to their excellent piezoelectric coefficient (d₃₃) and high Curie temperature (T_C). However, the temperature stability of its d₃₃ is poor in comparison with the Pb-based piezoelectric ceramics. To solve this problem, (K_0.5Na_0.5)_0.96Li_0.04(Nb_0.95Sb_0.05)O₃-(Bi_0.5Na_0.5)ZrO₃ (KNLNS-BNZ) piezoelectric ceramic with a single tetragonal phase (T phase) was designed and prepared by the conventional solid-state sintering method and texture engineering. It was found that KNLNS-BNZ-based textured ceramic with T phase at room temperature not only possessed a good piezoelectric coefficient (d₃₃=256 pC∙N^-1) and a longitudinal electromechanical coupling coefficient (k₃₃=34%), but also exhibited excellent temperature stability of d₃₃ and k₃₃in comparison to the non-textured ceramics. The change rates of d₃₃ and k₃₃for KNLNS-BNZ-based textured ceramics were 12% and 4% with the measured temperature of 25-250 ℃, respectively. In addition, the 1-3 type transducer composed of KNLNS-BNZ-based textured ceramics and epoxy resin was also prepared and investigated. This 1-3 type transducer not only exhibited a large bandwidth (BW=61.2%) and excellent signal strength (f_c=1 MHz), but also showed excellent temperature stability. As the measured temperature increased to 100 ℃, its bandwidth BW and center frequency f_c were 58.7% and 0.94 MHz, whose rates of change were 4% and 6% in comparison to the results measured at room temperature, respectively. All these results show that KNLNS-BNZ lead-free piezoelectric ceramics have good piezoelectric properties and excellent temperature stability, and the 1-3 type transducer prepared by KNLNS-BNZ can provide reference for the practical application of new lead-free piezoelectric ceramics.

Key words: potassium-sodium niobate, textured ceramic, piezoelectric property, transducer

中图分类号:

TM282

高天宇, 刘东, 赵思雪, 邓伟, 张波萍, 朱立峰. 温度稳定性优异的K_0.5Na_0.5NbO₃基压电陶瓷及其1-3型换能器[J]. 无机材料学报, 2025, 40(3): 297-304.

GAO Tianyu, LIU Dong, ZHAO Sixue, DENG Wei, ZHANG Boping, ZHU Lifeng. K_0.5Na_0.5NbO₃-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer[J]. Journal of Inorganic Materials, 2025, 40(3): 297-304.

图/表 6

图1 KNLNS-BNZ陶瓷的XRD图谱和SEM照片

Fig. 1 XRD patterns and SEM images of KNLNS-BNZ ceramics (a, b) XRD patterns of non-textured (a) and textured (b) ceramics; (c, d) SEM images of non-textured (c) and textured (d) ceramics. Colorful figures are available on website

图2 KNLNS-BNZ陶瓷的变温拉曼光谱图

Fig. 2 Variable temperature Raman spectra of KNLNS-BNZ ceramics (a, b) Variable temperature Raman contour maps of non-textured (a) and textured (b) ceramics; (c) Raman peak shift plots at variable temperature for non-textured and textured ceramics. Colorful figures are available on website

图3 KNLNS-BNZ陶瓷的介电性能

Fig. 3 Delectric properties of KNLNS-BNZ ceramics (a, b) Mesothermal spectra of non-textured (a) and textured (b) ceramics; (c, d) Fit γ values of non-textured (c) and textured (d) ceramics at 10 kHz. Colorful figures are available on website

图4 KNLNS-BNZ陶瓷的铁电性能

Fig. 4 Ferroelectric properties of KNLNS-BNZ ceramics (a, d) Variable temperature P-E loops of non-textured (a) and textured (d) ceramics; (b, e) Variable temperature I-E loops of non-textured (b) and textured (e) ceramics; (c, f) Variable temperature Ec and Pr curves of non-textured (c) and textured (f) ceramics. Colorful figures are available on website

图5 KNLNS-BNZ陶瓷的压电性能

Fig. 5 Piezoelectric properties of KNLNS-BNZ ceramics (a) Variable temperature d33 curves of non-textured and textured ceramics; (b) Change rate of d33 of non-textured and textured ceramics; (c, d) Variable temperature k33 curves of non-textured (c) and textured (d) ceramics

图6 KNLNS-BNZ织构陶瓷与环氧树脂组成的1-3型换能器

Fig. 6 Type 1-3 transducer composed of KNLNS-BNZ textured ceramics and epoxy resin (a) Preparative process of type 1-3 transducer; (b, c) Type 1-3 transducer test pulse signals at room temperature (b) and 100 ℃ (c)

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温度稳定性优异的K_0.5Na_0.5NbO₃基压电陶瓷及其1-3型换能器

K_0.5Na_0.5NbO₃-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer

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