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Tuning the microstructure, morphology, and electrical polarization behavior in BNT-BKT through hydrothermal method

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Abstract

Due to the abundant dielectric, ferroelectric, piezoelectric, and pyroelectric properties, dielectrics have found extensive applications in various fields. Particularly, the environmentally friendly and lead-free (1 − x)Bi0.5Na0.5TiO3−xBi0.5K0.5TiO3 (BNT-BKT) has attracted wide attention because of its well electrical polarization performance at the morphotropic phase boundary. Currently, so much research has been conducted on the property regulation of the BNT-BKT-based materials. However, there is still limited investigation into the influence of process parameters on electrical behavior using wet chemical methods. Meanwhile, the underlying mechanism also remains unclear. In this work, a series of BNT-BKT samples with fixed proportion have been prepared through adjusting the concentration of alkaline solution in hydrothermal method, followed by a detailed exploration of the microstructure, morphology, and various electrical polarization properties. The results indicate that BNT-BKT samples undergo the transition from rhombohedral to orthorhombic phase with increasing hydrothermal concentration. Moreover, higher concentration can effectively suppress the formation of strip-like grains due to element segregation. Furthermore, the enhancement in growth and stability of electric domains is observed, as well as the intensity and stability of electrical polarization behavior. The findings have guiding significance in performance modulation of lead-free dielectric materials and the design of related electronic devices.

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Funding

This work was supported by Natural Science Foundation of Guangxi Province (No. 2023JJA110088), the Central Government Guidance Funds for Local Scientific and Technological Development, China (No. Guike ZY22096024), Middle-aged and Young Teachers’ Basic Ability Promotion Project of Guangxi (No. 2023KY0065) and Innovation and Entrepreneurship Program for College Students of Guangxi (No. 202210602063).

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  1. L. G. Wang and C. H. Jiang contributed equally to this work.

Authors and Affiliations

  1. School of Physics and Technology, Guangxi Normal University, Guilin, 541004, People’s Republic of China

    L. G. Wang, C. H. Jiang, C. M. Zhu, Y. Q. Lv, H. Z. Dai & G. B. Yu

  2. Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin, 541004, People’s Republic of China

    C. M. Zhu

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  1. L. G. Wang
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Contributions

L.G. Wang: software, formal analysis, writing-original draft, funding acquisition, C.H. Jiang: resources, investigation, formal analysis, funding acquisition, C.M. Zhu: conceptualization, validation, data curation, writing-review and editing, supervision, project administration, funding acquisition, Y.Q. Lv: software, investigation, H.Z. Dai: methodology, formal analysis, G.B. Yu: data curation, funding acquisition.

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Correspondence to C. M. Zhu.

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Wang, L.G., Jiang, C.H., Zhu, C.M. et al. Tuning the microstructure, morphology, and electrical polarization behavior in BNT-BKT through hydrothermal method. J Mater Sci: Mater Electron 35, 970 (2024). https://doi.org/10.1007/s10854-024-12735-w

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