Enhanced energy storage and temperature-stable dielectric properties in (1-x)[(Na0.4K0.1Bi0.5)0.94Ba0.06TiO3]-xLa0.2Sr0.7TiO3 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
- 25-May-2024
- Publisher
- Elsevier Ltd
- Keywords
- Ceramics; Energy storage; Lead-free perovskite; 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/hongik/handle/2020.sw.hongik/33083
- 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)0.94Ba0.06TiO3]-xLa0.2Sr0.7TiO3 (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 (Wr) ∼ 2.39 J/cm3 with a good efficiency (η) of ∼ 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 105 cycles and good temperature stability of energy storage characteristics (Wr > 0.87 J/cm3, η > 74%) in the temperature range of 25–180 °C under 100 kV/cm. In addition, the temperature range in which the dielectric permittivity variation was less than ±15% was very wide (204 °C (63–267 °C) and 275 °C (39–314 °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)0.94Ba0.06TiO3]-xLa0.2Sr0.7TiO3 relaxor ceramics are promising for high energy density materials and electronic applications requiring high permittivity stability over a wide temperature range. © 2024
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