TY  - JOUR
AU  - Zhao, Jianwei
AU  - Qin, Hailan
AU  - Chen, Xiaoxin
AU  - Yu, Shuhui
AU  - Wang, Dawei
PY  - 2024
TI  - Enhanced piezoelectric properties and electrical resistivity in CaHfO3 modified BiFeO3–BaTiO3 lead-free piezoceramics
JO  - Journal of Materiomics
SN  - 2352-8478
SP  - 416
EP  - 422
VL  - 10
IS  - 2
AB  - 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.
UR  - https://doi.org/10.1016/j.jmat.2023.07.001
DO  - 10.1016/j.jmat.2023.07.001