Investigation of the Morphotropic Phase Boundary (MPB) of (1-x-y)BaZrO₃-x(K_0.45Na_0.5Li0.05)NbO₃-yBi (Mg_0.5Ti_0.5)O₃

Abstract:

Lead-based piezoelectric ceramics have excellent piezoelectric properties with the compositions near the rhombohedral-tetragonal morphotropic phase boundary (MPB)^[1,2]. In these materials, the dielectric and piezoelectric properties show the maximal values at MPB. For lead-free piezoelectric ceramics, finding the MPB area is a promising way to improve their properties. In this paper, the (1-x-y)BaZrO₃-x(K_0.45Na_0.5Li0.05)NbO₃-yBi (Mg_0.5Ti_0.5)O₃ lead-free piezoelectric ceramics were prepared by solid-state reaction method, and their piezoelectric properties and dielectric properties were investigated. With the increase of KNLN content, the crystal structure changed from rombohedral phase to tetragonal phase, thus existed a MPB^[3,4] between rombohedral and tetragonal phase. At room temperature, the specimen with the composition at MPB (x=0.93, y=0.01) shows the optimal piezoelectric properties (d₃₃=225pC/N and k_p=45%), which indicates that this material is a potential lead-free piezoceramic.

• Periodical: Materials Science Forum (Volume 787)
• Pages: 242-246
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.787.242
• Online since: April 2014
• Authors: Rui Lin Wu, Tomoaki Karaki*, Jiang Tao Zeng, Liao Ying Zheng, Wei Ruan, Xue Zheng Ruan, Guo Rong Li
• Keywords: KNN, Lead-Free, Morphotropic Phase Boundary, Piezoceramic, Ternary

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