Lead-free piezoelectric KNN-BZ-BNT films with a vertical morphotropic phase boundary

Wen Chen,Lingyan Wang,Wei Ren,Jinyan Zhao,Ming Liu

doi:10.1063/1.4928095

Wen Chen, Lingyan Wang + Show 3 more

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https://doi.org/10.1063/1.4928095

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Journal: AIP Advances	Publication Date: Jul 1, 2015
Citations: 11	License type: CC BY 3.0

Affiliation: Xi'an Jiaotong University

Abstract

The lead-free piezoelectric 0.915K0.5Na0.5NbO3-0.075BaZrO3-0.01Bi0.5Na0.5TiO3 (0.915KNN-0.075BZ-0.01BNT) films were prepared by a chemical solution deposition method. The films possess a pure rhomobohedral perovskite phase and a dense surface without crack. The temperature-dependent dielectric properties of the specimens manifest that only phase transition from ferroelectric to paraelectric phase occurred and the Curie temperature is 217 oC. The temperature stability of ferroelectric phase was also supported by the stable piezoelectric properties of the films. These results suggest that the slope of the morphotropic phase boundary (MPB) for the solid solution formed with the KNN and BZ in the films should be vertical. The voltage-induced polarization switching, and a distinct piezo-response suggested that the 0.915 KNN-0.075BZ-0.01BNT films show good piezoelectric properties.

Highlights

The lead-free piezoelectric 0.915K0.5Na0.5NbO3-0.075BaZrO3-0.01Bi0.5Na0.5TiO3 (0.915KNN-0.075BZ-0.01BNT) films were prepared by a chemical solution deposition method
The temperature stability of ferroelectric phase was supported by the stable piezoelectric properties of the films. These results suggest that the slope of the morphotropic phase boundary (MPB) for the solid solution formed with the KNN and BZ in the films should be vertical
For the preparation of KNN-BZ-BNT precursor solution, potassium acetate, sodium acetate, barium acetate, bismuth acetate, zirconium tetra-n-butoxide, tetrabutyl titanate and niobium ethoxide were used as starting materials. 2-methoxyethanol (2-MOE) was selected as the solvent

Summary

Introduction

Lead-free piezoelectric KNN-BZ-BNT films with a vertical morphotropic phase boundary The lead-free piezoelectric 0.915K0.5Na0.5NbO3-0.075BaZrO3-0.01Bi0.5Na0.5TiO3 (0.915KNN-0.075BZ-0.01BNT) films were prepared by a chemical solution deposition method. These results suggest that the slope of the morphotropic phase boundary (MPB) for the solid solution formed with the KNN and BZ in the films should be vertical.

Results

Conclusion