High Piezoelectric and Mechanical Properties for (K,Na)NbO <sub>3</sub> -Based Textured Piezoceramics
(K,Na)NbO3-based ceramics are promising lead-free piezoelectrics due to their excellent piezoelectric coefficient (d33) and high Curie temperature (Tc), but their poor mechanical properties limit high-reliability applications. To address this issue, 0.97K0.5Na0.5Nb0.95Sb0.05O3-0.03Bi0.5Na0.5ZrO3-0.5%wtBiFeO3-xZrO2(KNNS-xZrO2) textured ceramics were developed. Excessive ZrO2 improved mechanical performance, while <001>-oriented samples exhibited strong piezoelectricity. At x = 0.01, the ceramics achieved high values in the KNN system: d33 ∼ 326 pC·N−1, Hv ∼ 8.46 ± 0.14 GPa, E ∼ 172 ± 4 GPa, and fracture toughness KIC ∼ 1.70 ± 0.09 MPa·m1/2. Based on these outstanding properties, a KNNS-0.01ZrO2 piezoelectric wristband was fabricated to monitor human heart rate, producing stable current signals under different motion states. This work provides insights for reliable piezoelectric sensors and actuators.
Authors
- Zhenfu Zhang
- Pengju Sun (ORCID: https://orcid.org/0000-0003-2849-7373)
- Xiaoshuang Ma (ORCID: https://orcid.org/0000-0003-1354-8035)
- Yichao Wang (ORCID: https://orcid.org/0000-0002-6295-6492)
- Yi Han (ORCID: https://orcid.org/0000-0003-3864-6272)
- Jianqiang Li
- Xiang Hui
- Dong Liu
- Li-Feng Zhu (ORCID: https://orcid.org/0000-0001-9866-5534)
- Zhipeng Xing
Institutions
- National University of Defense Technology (CN)
- Inner Mongolia University (CN)
- Mongolian National University (MN)
- Division of Materials Science and Engineering (AU)
- University of Science and Technology Beijing (CN)
- Tsinghua University (CN)
Publication Details
- Journal
- ACS Applied Electronic Materials
- Published
- 2026-05-29
- DOI
- https://doi.org/10.1021/acsaelm.6c00735
- Primary Topic
- Ferroelectric and Piezoelectric Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities