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Research Article | Open Access

Synthesis and characterization of two-dimensional lead-free (K, Na)NbO3 micro/nano piezoelectric structures

Li-Qian CHENGa( )Mei FENGaYiwen SUNaZhen ZHOUbZe XUa
State Key Laboratory of Coal Resources and Safe Mining, Department of Materials Science and Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

Two-dimensional (2D) lead-free (K, Na)NbO3 (KNN) micro/nano structures with controllable K/Na ratio were successfully fabricated via a two-step molten salt synthesis (MSS). In this work, the reaction factors, including the proportion of molten salts, the types of carbonates, the sintering temperature, and the sintering time, were discussed in detail and the optimized condition was identified. The microstructure of KNN was confirmed by confocal Raman spectroscopy, while piezoresponse force microscopy (PFM) was applied to measure three-dimensional (3D) morphology and piezoelectric properties of KNN particles. The as-synthesized KNN platelets apparently possess anisotropic morphology and uniform structure, the size of which reaches 5–20 µm in length/width and 0.5–1 µm in thickness. It should be noted that the K/Na ratios of the KNN crystals are basically consistent while the proportion of salts changes within a certain range. The enrichment of Na element in the products is also observed, which owes to the smaller ionic radius of Na+ comparing to that of K+. This result provides a reference for the further preparation of textured ceramics and flexible piezoelectric generators.

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Journal of Advanced Ceramics
Pages 27-34
Cite this article:
CHENG L-Q, FENG M, SUN Y, et al. Synthesis and characterization of two-dimensional lead-free (K, Na)NbO3 micro/nano piezoelectric structures. Journal of Advanced Ceramics, 2020, 9(1): 27-34. https://doi.org/10.1007/s40145-019-0344-2

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Received: 14 February 2019
Revised: 21 May 2019
Accepted: 20 July 2019
Published: 05 February 2020
© The author(s) 2019

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