@article{Zhu2025, 
author = {Caixia Zhu and Jin Qian and Luomeng Tang and Cheng Shi and Bo Shen and Jiwei Zhai},
title = {Ultra-high energy harvester performance in KNN-based textured piezoceramics via multiscale reconfiguration design},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {10},
pages = {9221167},
keywords = {lead-free piezoelectric ceramics, phase structure, texturing engineering, domain configuration, piezoelectric energy harvester (PEH)},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221167},
doi = {10.26599/JAC.2025.9221167},
abstract = {The lower electromechanical performance of lead-free piezoelectric materials remains a critical bottleneck impeding their ability to replace lead-based materials in energy harvesting. To overcome this predicament, here, we propose a multiscale reconfiguration design to tailor the intricate coupling between the structure and properties of (K,Na)NbO3-based piezoelectric materials. The multiphase coexistence, local structural heterogeneity, enhanced crystal anisotropy, and acceptor doping yielded (K,Na)NbO3-based ceramics with a harmonious balance between the piezoelectric coefficient and the dielectric constant. As a result, the (K,Na)NbO3-based textured ceramics demonstrate exceptional piezoelectric properties, including a piezoelectric charge coefficient (d33) of 551 pC·N−1 and a piezoelectric voltage coefficient (g33) of 54.2 mV·m·N−1. The energy harvesting devices exhibit an ultrahigh instantaneous output power (Pout) of 4.85 mW and an instantaneous output power density (PD) of 70.2 μW·mm−3. This work provides valuable insights into the design and development of high-performance lead-free piezoelectric ceramics and significantly advances the potential of (K,Na)NbO3-based ceramics as viable replacements for Pb(Zr,Ti)O3-based ceramics in energy harvesting applications.}
}