Ca2+ doping effects in (K, Na, Li)(Nb0.8Ta0.2)O3 lead-free piezoelectric ceramics

doi:10.1007/s11706-019-0485-9

Front. Mater. Sci.

2019, Vol. 13

Issue (4) : 431-438 https://doi.org/10.1007/s11706-019-0485-9

RESEARCH ARTICLE

Ca²⁺ doping effects in (K, Na, Li)(Nb_0.8Ta_0.2)O₃ lead-free piezoelectric ceramics

Lei TANG¹, Tengfei LIU¹, Jinxu MA¹, Xiaowen ZHANG², Linan AN³, Kepi CHEN¹(

)

¹. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
². State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
³. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA

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Abstract

Lead-free (K_0.5−_x_/2Na_0.5−_x_/2Li_x)(Nb_0.8Ta_0.2)O₃ (KNLNT) and (K_0.49−_x_/2Na_0.49−_x_/2- Li_xCa_0.01)(Nb_0.8Ta_0.2)O₃ (KNLNT-Ca) ceramics were prepared by a conventional ceramic processing. Structural analysis shows that the Ca²⁺ doping takes the A site of ABO₃ perovskite and decreases the phase transition temperature. Property measurements reveal that as a donor dopant, the Ca²⁺ doping results in higher room-temperature dielectric constant, lower dielectric loss, and lower mechanical quality factor. In addition, the Ca²⁺ doping does not change the positive piezoelectric coefficient d₃₃, but increases the converse piezoelectric coefficient d₃₃^* significantly. This is likely due to the increase in the relaxation, as well as the appearance of (Ca_Na/K^•--V_Na/K′) defect dipoles.

Keywords lead-free piezoelectric KNN converse piezoelectric coefficient donor dopant piezoelectric property polymorphic phase transition

Corresponding Author(s): Kepi CHEN

Online First Date: 26 November 2019 Issue Date: 04 December 2019

Cite this article:

Lei TANG,Tengfei LIU,Jinxu MA, et al. Ca²⁺ doping effects in (K, Na, Li)(Nb_0.8Ta_0.2)O₃ lead-free piezoelectric ceramics[J]. Front. Mater. Sci., 2019, 13(4): 431-438.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-019-0485-9
https://academic.hep.com.cn/foms/EN/Y2019/V13/I4/431

Fig.1 (a) XRD patterns of KNLNT and KNLNT-Ca ceramics of different compositions as labeled, and (b) enlarged views of the patterns between 44.5° and 46.5°.

Fig.2 (a)(b)(c)(d)(e) Plots of dielectric constant versus temperature. (f) A plot of Curie temperature versus the Li⁺ concentration.

Fig.3 (a)(b)(c)(d)(e) Plots of ln(1/ϵ−1/ϵ_m) versus ln(T−T_C). (f) A plot of γ versus the Li⁺ content for KNLNT and KNLNT-Ca ceramics.

Fig.4 SEM images of (a) KNLNT ceramics sintered at 1100 °C and (b) KNLNT-Ca ceramics sintered at 1080 °C.

Fig.5 Plots of electrical properties of KNLNT and KNLNT-Ca ceramics as a function of the Li⁺ content.

Fig.6 (a)(b)(c)(d)(e)P–E loops and (f) a plot of P_r versus the Li⁺ content for KNLNT and KNLNT-Ca ceramics.

Fig.7 Coercive field E_C for KNLNT and KNLNT-Ca ceramics.

Fig.8 Electric field-induced strain in KKNLNT and KKNLNT-Ca ceramics.

Fig.9 Converse piezoelectric constant d₃₃^* as a function of the Li⁺ content.

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