BiCoO3-doped (K0.475Na0.475Li0.05)(Nb0.8Ta0.2)O3 lead-free piezoelectric ceramics

doi:10.1007/s11706-012-0186-0

Front Mater Sci

2012, Vol. 6

Issue (4) : 311-318 https://doi.org/10.1007/s11706-012-0186-0

RESEARCH ARTICLE

BiCoO₃-doped (K_0.475Na_0.475Li_0.05)(Nb_0.8Ta_0.2)O₃ lead-free piezoelectric ceramics

Ke-Pi CHEN(

), Zhe ZHANG

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

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Abstract

(1--x)(K_0.475Na_0.475Li_0.05)(Nb_0.8Ta_0.2)O₃--xBiCoO₃ (KNLNT--BC) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method. Effects of the BC content on the phase structure, microstructure and electrical properties of KNLNT--BC ceramics were investigated. XRD patterns reveal that all the ceramic samples are in the pure perovskite-type structure, and the phase structure changes from the tetragonal to pseudo-cubic phase with the increase of the BC content. After the substitution of BC, the grain size is significantly reduced and relaxer behaviors are induced. By adding a small amount of BC to KNLNT ceramics, piezoelectric properties are improved, while further addition of BC makes the piezoelectric properties deteriorate markedly. The optimized electrical properties at x = 0.005 are as follows: d₃₃ = 194 pC/N, k_p = 0.44.

Keywords lead-free ceramic potassium sodium niobate BiCoO₃ piezoelectric property

Corresponding Author(s): CHEN Ke-Pi,Email:ckp@ncepu.edu.cn

Issue Date: 05 December 2012

Cite this article:

Ke-Pi CHEN,Zhe ZHANG. BiCoO₃-doped (K_0.475Na_0.475Li_0.05)(Nb_0.8Ta_0.2)O₃ lead-free piezoelectric ceramics[J]. Front Mater Sci, 2012, 6(4): 311-318.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-012-0186-0
https://academic.hep.com.cn/foms/EN/Y2012/V6/I4/311

Fig.1 XRD patterns of (1-)KNLNT–BC ceramics with the 2 degree ranging from 20° to 80° and ranging from 44.3° to 46.8°.

Fig.2 Compositional dependence of Curie points of (1-)KNLNT–BC ceramics.

Fig.3 Temperature dependence of dielectric constant for the (1-)KNLNT–BC ceramics.

Fig.4 Surface morphologies of (1-)KNLNT–BC ceramic samples sintered at 1060°C for 2 h: = 0; = 0.005; = 0.01; = 0.015; = 0.02; = 0.025; = 0.03; = 0.035.

Fig.5 Surface morphologies of (1-)KNLNT–BC ceramics sintered at 1060°C for 24 h: = 0; = 0.005; = 0.01; = 0.015; = 0.02; = 0.025; = 0.03; = 0.035.

Fig.6 Compositional dependence of piezoelectric coefficient , electromechanical coupling factor , and mechanical quality factor for (1-)KNLNT–BC ceramics.

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