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Achieving superb electric energy storage in relaxor ferroelectric BiFeO3-BaTiO3-NaNbO3 ceramics via O2 atmosphere by Rhys Montecillo; Cheng-Sao Chen; Kuei-Chih Feng; R.R. Chien; Shu-Chih Haw; Pin-Yi Chen; Chi-Shun Tu is a Materials Science article available to read on EtoBox.

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Lead-free perovskite dielectric materials for storing electrical energy have been widely investigated due to their high polarization and reversible phase. However, their low electric resistivity limits the energy density and stability. In this study, the (1-x)(0.7BiFeO 3 -0.3BaTiO 3 )-xNaNbO 3 ceramics (x = 0 -0.2) were prepared using two sintering atmospheres (air and oxygen). A superb recoverable energy-stored density (W rec ) of 8.2 J/cm 3 and efficiency (η) of 70% was achieved at x = 0.15 sintered in O 2 atmosphere. The superior W rec is due to the structural coexistence of ferroelectric rhombohedral (R3c), nonpolar cubic (Pm-3m), and antiferroelectric orthorhombic (Pbam) symmetries, tailored via antiferroelectric NaNbO 3 addition. The improved breakdown strengths (up to 325 kV/cm) are due to the increased interatomic bonding linked to the BO 6 octahedron and lattice network. Altogether, NaNbO 3 -substitution and O 2 sintering synergistically resulted in excellent energy storage and pave a scheme of antiferroelectric-tailoring BiFeO 3 -BaTiO 3 -NaNbO 3 relaxor ferroelectrics for dielectric capacitor.

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Author

Rhys Montecillo; Cheng-Sao Chen; Kuei-Chih Feng; R.R. Chien; Shu-Chih Haw; Pin-Yi Chen; Chi-Shun Tu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)