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5. High Piezoelectric Properties and High TC in KNN-Based Lead-Free Ceramics Sintered in Reducing Atmosphere

Author

Zhen, Yi Chao, Cen, Zhen Yong, Feng, Wei, Wang, Xiao Hui, and Li, Long Tu

Abstract

Lead-free MnO doped 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3 (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 TC = 350 °C, insulation resistivity ρ=4.83 × 1011 (Ω・cm), and high field piezoelectric constants =438 pm/V (at Emax = 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.

Published
2018
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6. Temperature independence of piezoelectric properties for high-performance BiFeO 3 -BaTiO 3 lead-free piezoelectric ceramics up to 300 °C.

Author

Zhu LF, Liu Q, Zhang BP, Cen ZY, Wang K, Li JJ, Bai Y, Wang XH, and Li JF

Abstract

The temperature-dependence behaviors of ferroelectric, piezoelectric, k p and electrical-field-induced strain were carefully evaluated for high-performance BiFeO 3 -0.3BaTiO 3 (BF-0.3BT) ceramics. There results indicate, combined with Rayleigh analysis and temperature-dependence XRD and PFM, that the increase of strain and large signal with increasing the temperature from room temperature to 180 °C is related to the joint effect of intrinsic contribution (lattice expansion) and extrinsic contribution (domain switching). With further increasing the temperature to 300 °C, the large signal d 33 and electrical-field-induced strain mildly decrease because of the increase of conductivity for BF-0.3BT ceramics. However, different from strain and large signal the small signal d 33 (E 0 ) and k p exhibit excellent temperature stability behavior as the temperature increases from room temperature to 300 °C., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2018
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