Enhanced energy-storage properties and charge-discharge performances in Sm3+ modified (Na0.5Bi0.5)TiO3-SrTiO3 lead-free relaxor ferroelectric ceramics. (April 2022)

• Record Type: Journal Article
• Authors: Su, Qian; Zhu, Jianye; Ma, Ziyue; Meng, Xiangjun; Zhao, Ye; Li, Yong; Hao, Xihong
• Is Part Of: Materials research bulletin. Volume 148(2022)
• Publication Date: 2022-04
• Subjects: Na0.5Bi0.5TiO3-based ceramics -- Relaxor ferroelectrics -- Energy-storage properties -- Charge-discharge performances; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111675
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: The electric breakdown strength of NBT-SST RFE ceramics enhances from 180 to 305 kV/cm due to the refined grains by doping Sm 3+ . The introduction of Sm 3+ enhances the relaxor characteristic of NBT-SST RFE ceramics due to the polar nano-regions induced. A high recoverable energy density of 3.81 J/cm 3 and a high energy efficiency of 84.7% were achieved in 0.5Bi0.5 Na0.5 TiO3 -0.5Sr0.7 Sm0.2 TiO3 ceramic. Abstract: Relaxor ferroelectric materials are highly favorable for pulse power devices owing to the fast charge-discharge speed and large power density. However, the low energy density is still a shortcoming for energy-storage applications. In this work, the excellent energy-storage properties are achieved in 0.5Na0.5 Bi0.5 TiO3 -0.5Sr1-1.5x Smx TiO3 (NBT-SST) relaxor ferroelectric ceramics by a synergistic effect of microstructures based on Sm 3+ doping. It is proposed that the introduction of Sm 3+ decreases the grain size and tunes the domain structure, leading to the increase of breakdown strength and the enhancement of relaxation characteristics. The maximum recoverable energy-storage density reaches 3.81 J/cm 3 coupled with an energy efficiency of 84.7% when x = 0.2. Meanwhile, the ceramic exhibits superior energy-storage stability in the temperature (20–200 ℃) and frequency (10–400 Hz) ranges. Moreover, a high-power density of 135 MW/cm 3 and a fast charge-discharge speed of 89 ns are also achieved for ceramic with x = 0.2. These results suggest the NBT-SST ceramic is a potential candidate material in energy-storage capacitor applications. Graphical abstract: Image, graphical abstract