Enhanced Piezoelectric Properties of (Na_0.535K_0.485)_0.905Li_0.095(Nb_0.94Ta_0.06)O₃ –(Na_0.5Bi_0.5)TiO₃ Lead-Free Piezoelectric Ceramics in the MPB Composition

Abstract:

In this paper, end members of tetragonal phase (Na_0.535K_0.485)_0.905Li_0.095(Nb_0.94Ta0.06)O₃ (abbreviated as NKLN) and rhombohedral phase (Na_0.5Bi_0.5)TiO₃ (abbreviated as NBT) were used to fabricate dense (1-x)NKLN-xNBT (x=0, 0.005, 0.01, 0.02, 0.03, 0.04) lead-free piezoelectric ceramics. By increasing the NBT content x value, the crystalline structure changes from tetragonal phase to rhombohedral one across a morphotropic phase boundary (MPB) composition of x=0.02. In this MPB composition, enhanced electrical properties were obtained as follows: piezoelectric constant d₃₃=202 pC/N, planar electromechanical coupling coefficient k_p=39.6%, relative dielectric constant ε_r=1020 and dielectric loss tgδ=2.67%, indicating that this ceramic was a promising lead-free piezoelectric material for practical applications.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1390-1394
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1390
• Online since: June 2012
• Authors: Zong Yang Shen, Zu Gui Xiao, Yue Ming Li, Zhu Mei Wang, Yan Hong
• Keywords: KNN, Lead Free, MPB, Piezoelectric Ceramic (PZT)

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