INFLUENCE OF Pr6O11-DOPING ON THE CRYSTAL STRUCTURE AND ELECTRICAL PROPERTIES OF BNBT PIEZOELECTRIC CERAMICS
Influence of Pr6O11 Doping on Electrical Properties of BNBT Ceramics
DOI:
https://doi.org/10.55766/sujst9183Keywords:
BNBT, Pr6O11, Perovskite, Solid-state combustion, DielectricAbstract
In this work, a series of lead-free 0.97(Bi0.5Na0.5)TiO3-0.03BaTiO3-xPr6O11 (BNBT-xPr) piezoelectric materials with x=0, 0.1, 0.3, 0.5, and 0.7 wt.% were created by the solid-state combustion route, to enhance their electric properties. The investigation on the phase evolution, microstructure, and electrical behavior of the specimens were carried out. The powders and ceramics were calcined and sintered for two hours at 800℃ and 1180℃, correspondingly. All examples displayed a perfect perovskite lattice and no detectable impurity phase. XRD pattern examination for the ceramics disclosed the existence of rhombohedral and tetragonal phases in all examples. The rhombohedral phase was boosted by rising the doping levels, as established by the Rietveld refinement study. As the x content rose, the average grain size and measured density began to decrease from 0.90±0.10 to 0.73±0.07 µm and 6.13 to 6.05 g/cm3, correspondingly. It was noticed that Pr6O11 doping, decreased dielectric properties. The remnant polarization (Pr) of the samples rises from 22.2 to 27.7 µC/cm2 with x rises from 0 to 0.3 and then dropped. The coercive field (Ec) of the ceramics rises significantly when Pr6O11 was incorporated. The BNBT lead-free ceramics doped with 0.3wt%Pr6O11, with a high Pr value, could be a promising candidate for memory applications to replace Pb-based ceramics.
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