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Research Article | Open Access

Enhanced piezoelectric properties and electrical resistivity in CaHfO3 modified BiFeO3–BaTiO3 lead-free piezoceramics

Jianwei Zhaoa,( ), Hailan Qina,b, Xiaoxin Chena,b, Shuhui Yua, Dawei Wangc( )
Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, Guangdong, China
College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, Guangxi, China
Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, 150080, Heilongjiang, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

A number of CaHfO3 modified BiFeO3-0.33BaTiO3 (BF-0.33BT-xCH) lead-free piezoceramics were fabricated through the solid-state sintering method and comprehensively investigated in this work. Under the optimal sintering temperature, all compositions display a typical perovskite structure in a pseudo-cubic phase with slightly larger lattice parameters as the CH content increases. The electrical resistivity is highly enhanced due to the addition of CH. Microstructures, including the grain morphology, core-shell structure, and chemistry inhomogeneities, are demonstrated upon different BF-0.33BT-xCH compositions. In particular, the core-shell structures with non-uniform element distributions in the compositions can be eliminated by adding sufficient CH content (x > 0.05). The highest saturation polarization (40.1 μC/cm2), remnant polarization (26.8 μC/cm2), and converse piezoelectric coefficient (290 pm/V) are achieved in the BF-0.33BT-0.01CH piezoceramic, which are significantly enhanced in comparison with the undoped BF-0.33BT piezoceramic. With further increasing the CH content, the piezoelectric properties of BF-0.33BT-xCH ceramics decline rapidly, and they start to exhibit characteristics of relaxor ferroelectrics.

Keywords

Core-shell structurePiezoelectric propertyImpedanceLead-free piezoelectricCaHfO3 modified BF-0.33BT

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Journal of Materiomics
Volume 10 Issue 2,
March 2024
Pages 416-422
DOI: 10.1016/j.jmat.2023.07.001
Cite this article:
Zhao J, Qin H, Chen X, et al. Enhanced piezoelectric properties and electrical resistivity in CaHfO3 modified BiFeO3–BaTiO3 lead-free piezoceramics. Journal of Materiomics, 2024, 10(2): 416-422. https://doi.org/10.1016/j.jmat.2023.07.001

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Received: 27 April 2023
Revised: 03 July 2023
Accepted: 03 July 2023
Published: 24 July 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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