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Effects of Li and Y co-doping on electrical properties and dielectric relaxation behavior of BCZT ceramics

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Abstract

In order to research the effects of Li and Y (Li/Y) co-doping on BCZT ceramics, lead-free (Ba0.85Ca0.15) (Ti0.9Zr0.1) + xLi2CO3 + xY2O3 (abbreviated as BCZT-LixYx, x = 0, 0.1, 0.2, 0.3, and 0.4 mol%) piezoceramics were synthesized by traditional solid-state sintering method. The phase structure and microstructure of ceramic samples were researched through XRD and SEM. The electrical properties of ceramic samples were researched by piezoelectric, dielectric, and ferroelectric test instruments. The XRD spectrums indicate that ceramic samples have the perovskite structure. The SEM images show that the introduction of Li/Y in BCZT ceramics can promote grain growth and densification. The temperature-dependent dielectric performance testing results prove that BCZT-LixYx ceramic samples have apparent dielectric relaxation behavior. Moreover, co-doping Li/Y in BCZT ceramics can effectively decrease the sintering temperature from 1540 °C to 1400 °C and improve the electrical properties. The optimal electrical properties are obtained at x = 0.3 mol% (d33 = 526 pC/N, kp = 58%, εr = 4724, tanδ = 0.017, Tc = 75.5 °C, γ = 1.63, Pr = 9.73 µC/cm2, Ec = 2.10 kV/cm).

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Acknowledgements

The authors sincerely acknowledge the support of the National Natural Science Foundation of China (Grant Number 51762009), the Project of Guizhou Provincial Education Department [Grant Number QJH KY Z (2017)001], and the Project of Guizhou Provincial Science and Technology Department [Grant Number QKHJC-ZK (2021) ZD 049].

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  1. College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, Guizhou, China

    Chang-Qun Wang, Chun Shu, De-Yi Zheng & Shun Luo

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  1. Chang-Qun Wang
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Wang, CQ., Shu, C., Zheng, DY. et al. Effects of Li and Y co-doping on electrical properties and dielectric relaxation behavior of BCZT ceramics. J Mater Sci: Mater Electron 33, 3822–3834 (2022). https://doi.org/10.1007/s10854-021-07573-z

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