Issue 41, 2018

A high temperature stable piezoelectric strain of KNN-based ceramics

Abstract

Lead-free (1 − x)(0.96K0.46Na0.54Nb0.98Ta0.02O3–0.04Bi0.5(Na0.82K0.18)0.5ZrO3)–xCaZrO3 ((1 − x)(0.96KNNT–0.04BNKZ)–xCZ) piezoelectric ceramics were prepared by the conventional solid-state reaction method. The CaZrO3 dopant can induce a coexisting phase boundary with the transition from the orthorhombic/tetragonal phase to the R phase. Domains that exist across the grain boundary within neighboring grains appear in the ceramics with x = 0.01, which can result in an increase in ferroelectricity due to its long-range order organization. The CaZrO3 dopant results in the formation of polar nanodomains and induces the appearance of diffuse ferroelectrics. The ceramics with x = 0.01 show optimal piezoelectric properties (d33 = 300 pC N−1 and Image ID:c8ta07908k-t1.gif = 500 pm V−1 at 25 kV cm−1). Meanwhile, their high level of unipolar strain reaches up to 0.175% at 35 kV cm−1 at room temperature, and their field-induced strain varies less than 10% from room temperature to 120 °C. The ceramics with x = 0.02 possess a remarkably high temperature stability of Image ID:c8ta07908k-t2.gif (Te = 200 °C). For x = 0.005–0.025, a higher amount of the CaZrO3 dopant can obviously improve the temperature stability of Image ID:c8ta07908k-t3.gif The (1 − x)(0.96KNNT–0.04BNKZ)–xCZ system is a promising lead-free piezoelectric candidate material for commercial applications.

Graphical abstract: A high temperature stable piezoelectric strain of KNN-based ceramics

Associated articles

Supplementary files

Article information

Article type
Communication
Submitted
15 Aug 2018
Accepted
21 Sep 2018
First published
22 Sep 2018

J. Mater. Chem. A, 2018,6, 19967-19973

A high temperature stable piezoelectric strain of KNN-based ceramics

Z. Cen, Y. Huan, W. Feng, Y. Yu, P. Zhao, L. Chen, C. Zhu, L. Li and X. Wang, J. Mater. Chem. A, 2018, 6, 19967 DOI: 10.1039/C8TA07908K

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