Enhanced energy storage and temperature-stable dielectric properties in (1-x)[(Na<sub>0.4</sub>K<sub>0.1</sub>Bi<sub>0.5</sub>)<sub>0.94</sub>Ba <sub>0.06</sub>TiO<sub>3</sub>]-xLa<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub >3</sub> lead-free relaxor ceramics
- Authors
- Yadav, Arun Kumar; Yoo, Il-Ryeol; Choi, Seong-Hui; Park, Je-Yeon; Kim, Min-Seok; Cho, Jiung; Song, Hyun-Cheol; Cho, Kyung-Hoon
- Issue Date
- May-2024
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Lead-free perovskite; Ceramics; Energy storage; Relaxor ferroelectrics; Temperature stability
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.985
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 985
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28682
- DOI
- 10.1016/j.jallcom.2024.174016
- ISSN
- 0925-8388
1873-4669
- Abstract
- With the continuous growth in sustainable and renewable technologies, ceramic capacitors are emerging as a promising energy storage device. Lead-free (1-x)[(Na0.4K0.1Bi0.5)(0.94)Ba0.06TiO3]-xLa(0.2)Sr(0.7)TiO(3) (0 <= x <= 0.40) ceramics were prepared using the solid-state reaction technique for obtaining relaxor characteristics with improved energy storage density, efficiency, and temperature stability of dielectric permittivity. A high recoverable energy density (W-r) similar to 2.39 J/cm(3) with a good efficiency (eta) of similar to 75.21% was obtained for x = 0.30 composition under 220 kV/cm applied field. The specimen x = 0.30 exhibited excellent fatigue resistance during 10(5) cycles and good temperature stability of energy storage characteristics (W-r > 0.87 J/cm(3), eta > 74%) in the temperature range of 25-180 degrees C under 100 kV/cm. In addition, the temperature range in which the dielectric permittivity variation was less than +/- 15% was very wide (204 degrees C (63-267 degrees C) and 275 degrees C (39-314 degrees C) for x = 0.30 and 0.20 specimens, respectively). Significant improvements in material performance were attributed to A-site engineering, which resulted in a mixture of P4bm and R3c polar nano regions (PNRs), leading to reduced hysteresis loss and temperature-stable dielectric permittivity. Additionally, the size of PNRs ranged between 3 and 6 nm, with the P4bm phase dominating in the x = 0.30 specimen, leading to a large maximum polarization under an applied electric field. Therefore, (1-x)[(Na0.4K0.1Bi0.5)(0.94)Ba0.06TiO3]-xLa(0.2)Sr(0.7)TiO(3) relaxor ceramics are promising for high energy density materials and electronic applications requiring high permittivity stability over a wide temperature range.
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Collections - School of Mechanical System Engineering > 1. Journal Articles
- Department of Materials Science and Engineering > 1. Journal Articles
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