Enhanced energy storage performance and temperature stability achieved by a synergic effect in Nd3+/Ga3+ co-doped (Na0.5Bi0.5)TiO3 -based ceramics. Issue 21 (1st November 2022)

• Record Type: Journal Article
• Authors: Wu, Chen; Qiu, Xiaoming; Ge, Wenwei; Liu, Changyi; Zhao, Hongwei; Chen, Luyao; Liu, Zhaodong; Li, Liang; Fisher, John G.
• Is Part Of: Ceramics international. Volume 48:Issue 21(2022)
• Page Start: 31931
• Page End: 31940
• Publication Date: 2022-11-01
• Subjects: Capacitors (E) -- Perovskites (D) -- Ferroelectric properties (C) -- Energy storage; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.07.129
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: (1- x )(0.75(Na0.5 Bi0.5 )TiO3 -0.25SrTiO3 )- x NdGaO3 ceramics (NBST- x NG, x = 0–0.06) were fabricated through a solid-state reaction method. High-valent Nd 3+ ions enter the perovskite A-site to occupy Bi vacancies resulting from the volatilization of Bi, inhibiting the formation of oxygen vacancies and contributing to an enhanced breakdown electric field ( E b ). Low-valent Ga 3+ ions enter the B-site to substitute for Ti 4+ ions, resulting in the formation of random electric fields (REFs) at the B-site due to co-occupying hetero-valence ions of Ga 3+ /Ti 4+, which significantly reduces ferroelectric hysteresis. Therefore, a synergic effect of A- and B-sites co-doping was realized in NBST- x NG ceramics. Benefitting from this synergic effect, an enhanced recoverable energy storage density ( W rec ) of 2.88 J/cm 3 and an efficiency ( η ) of 83% are simultaneously obtained in NBST-0.04NG ceramics under a moderate electric field ( E ) of 200 kV/cm. Compared with most NBT-based ceramics, the values of ( η vs W rec / E 2 ) for NBST-0.04NG ceramics show an obvious advantage, indicating excellent potential for application as an energy storage material. Moreover, W rec and η of NBST-0.04NG ceramics exhibit excellent temperature stability from 30 °C to 200 °C due to the enhanced correlation strength of polar nanoregions (PNRs) and local structural stability. This work provides a potential strategy to improve the energy storage performance of NBT-based ceramics via the synergic effect of A- and B-site co-doping.