High Piezoelectric Properties and High T_C in KNN-Based Lead-Free Ceramics Sintered in Reducing Atmosphere

Abstract:

Lead-free MnO doped 0.955K_0.5Na_0.5NbO₃-0.045Bi_0.5Na_0.5ZrO₃ (abbreviate as KNN-0.045BNZ) ceramics have been prepared by a conventional solid-state sintering method in a reducing atmosphere. The addition of MnO suppresses grain growth and eliminates the liquid phase. MnO dopant changes the crystalline structures of KNN-0.045BNZ ceramics from the classical Morphotropic Phase Boundary (MPB) with rhombohedral phase (R) and tetragonal phase (T) to the suppressed MPB with R/T phase. The 0.4% MnO doped KNN-0.045BNZ ceramics show an excellent electrical properties with quasi static piezoelectric constant d₃₃=300 pC/N, Curie temperature T_C = 350 °C, insulation resistivity ρ=4.83 × 10¹¹ (Ω・cm), and high field piezoelectric constants =438 pm/V (at E_max = 25 kV/cm). The results indicate that the 0.4%Mn doped KNN-0.045BNZ ceramic is a promising lead-free piezoelectric candidate material for commercial applications.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 628-633
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.628
• Online since: August 2018
• Authors: Yi Chao Zhen, Zhen Yong Cen, Wei Feng, Xiao Hui Wang*, Long Tu Li
• Keywords: Lead-Free Ceramics, Piezoelectric Materials, Reducing Atmosphere

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