Excellent energy storage density and efficiency in lead-free Sm-doped BaTiO3–Bi(Mg0.5Ti0.5)O3 ceramics. Issue 38 (17th September 2020)

• Record Type: Journal Article
• Authors: Liu, Zhi-Gang; Tang, Zhen-Hua; Hu, Song-Cheng; Yao, Di-Jie; Sun, Fei; Chen, De-Yang; Guo, Xiao-Bin; Liu, Qiu-Xiang; Jiang, Yan-Ping; Tang, Xin-Gui
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 38(2020)
• Page Start: 13405
• Page End: 13414
• Publication Date: 2020-09-17
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc03035j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Doping decreased oxygen vacancies in ceramics, resulting in high breakdown field strength and excellent energy storage performances. Abstract : Progress in energy storage ceramics for applications has been of interest owing to their clean green nature and excellent ferroelectric/dielectric performances. In this study, lead-free Sm-doped 0.95BaTiO3 –0.05Bi(Mg0.5 Ti0.5 )O3 (BT–BMT– x Sm) relaxor ferroelectric ceramics were synthesized and confirmed to be an appropriate material for storage devices. After the introduction of Sm2 O3 into BT–BMT ceramics, their hysteresis loops gradually shrank and became slender, which is beneficial to achieving high efficiency energy storage in ceramic capacitors. The maximum recoverable energy density for the BT–BMT– x Sm ( x = 0.03) sample reached 3.86 J cm −3 at normal temperature, and its corresponding energy efficiency reached 81.6%. Moreover, it was found from impedance spectroscopy that the breakdown field strength is related to the oxygen defect content in the samples. Ceramic samples with fewer defects have better insulation performance, which means that a high breakdown field strength will be obtained. With proper doping, enhanced relaxor behaviour and breakdown field strength were obtained to achieve excellent energy storage properties.