Superior Piezoelectric Properties in Potassium-Sodium Niobate Lead-Free Ceramics

Kai Xu; Jun Li; Xiang Lv; Jiagang Wu; Xixiang Zhang; Dingquan Xiao; Jianguo Zhu

doi:10.1002/adma.201601859

Superior Piezoelectric Properties in Potassium-Sodium Niobate Lead-Free Ceramics

Adv Mater. 2016 Oct;28(38):8519-8523. doi: 10.1002/adma.201601859. Epub 2016 Jul 21.

Authors

Kai Xu¹, Jun Li², Xiang Lv¹, Jiagang Wu³, Xixiang Zhang⁴, Dingquan Xiao¹, Jianguo Zhu¹

Affiliations

¹ Department of Materials Science, Sichuan University, 610064, Chengdu, P. R. China.
² Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 239955, Kingdom of Saudi Arabia.
³ Department of Materials Science, Sichuan University, 610064, Chengdu, P. R. China. wujiagang0208@163.com, msewujg@scu.edu.cn.
⁴ Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 239955, Kingdom of Saudi Arabia. xixiang.zhang@kaust.edu.sa.

PMID: 27441456
DOI: 10.1002/adma.201601859

Abstract

A superior piezoelectric coefficient (d₃₃ = 570 ± 10 pC N^"1 ), the highest value reported to date in potassium-sodium niobate-based ceramics, is obtained in (1-x-y)K_1-w Na_w Nb_1-z Sb_z O_3-y BaZrO_3-x - Bi_0.5 K_0.5 HfO₃ ceramics. This high d₃₃ value can be ascribed to the co-existence of "nano-scale strain domains" (1-2 nm) and a high density of ferroelectric domain boundaries. Therefore, ternary KNN-based ceramics demonstrate the potential for applications.

Keywords: (K,Na)NbO3; giant piezoelectricity; nanodomains; phase boundaries.