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Structure and electrical properties in CuO-modified BCZT lead-free piezoelectric ceramics

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Abstract

Ba0.85Ca0.15Zr0.1Ti0.9O3-x wt% CuO (BCZT-xCu) lead-free piezoelectric ceramics were designed and synthesized using a traditional solid-state reaction method to improve both the relaxor behavior and the electrical properties of BCZT lead-free piezoelectric ceramics. The Cu2+ diffuses into the BCZT lattice and forms ABO3 perovskite solid solution. Additionally, X-ray diffraction patterns and Raman spectra reveal that the introduction of CuO causes phase transition from the O-T phase coexistence to the O phase in BCZT-xCu. SEM displays that BCZT-xCu has a well microstructure at CuO doping amount between 0.5 wt% and 1 wt%. With the increasing CuO content, the orthorhombic-tetragonal (TO-T) phase transition shifted towards higher temperature, while Curie temperature (Tc) shifted towards lower temperature. Moreover, the dielectric diffusivity γ increases from 1.63 to 1.92 as x increases. Results indicate that optimal electrical properties, namely d33 = 315 pC/N, kp = 34%, εr = 3213, tanδ = 2.71%, Pr = 7.45 µC/cm2 and Ec = 2.75 kV/cm are achieved in the 1 wt% CuO added ceramic sintered at 1250°C for 2 h.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2019YFC1907103-04), Funding for school-level research projects of Yancheng Institute of Technology (No. xj201528, xjr2021016), General Program of Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (No. 16KJB430030) and Postgraduate Research & Practice Innovation Program of Yancheng Institute of Technology (SJCX22_XZ001).

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Correspondence to Jianzhou Du or Kongjun Zhu.

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Du, J., Qiu, L., Yang, C. et al. Structure and electrical properties in CuO-modified BCZT lead-free piezoelectric ceramics. J Electroceram 49, 125–134 (2022). https://doi.org/10.1007/s10832-022-00298-3

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