@article{Zhao2024, 
author = {Jianwei Zhao and Hailan Qin and Xiaoxin Chen and Shuhui Yu and Dawei Wang},
title = {Enhanced piezoelectric properties and electrical resistivity in CaHfO3 modified BiFeO3–BaTiO3 lead-free piezoceramics},
year = {2024},
journal = {Journal of Materiomics},
volume = {10},
number = {2},
pages = {416-422},
keywords = {Lead-free piezoelectric, CaHfO3 modified BF-0.33BT, Core-shell structure, Impedance, Piezoelectric property},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2023.07.001},
doi = {10.1016/j.jmat.2023.07.001},
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.}
}