Achieving high energy storage properties in perovskite oxide via high-entropy design. Issue 8 (15th April 2023)

• Record Type: Journal Article
• Authors: Ning, Yating; Pu, Yongping; Zhang, Qianwen; Zhou, Shiyu; Wu, Chunhui; Zhang, Lei; Shi, Yu; Sun, Zixiong
• Is Part Of: Ceramics international. Volume 49:Issue 8(2023)
• Page Start: 12214
• Page End: 12223
• Publication Date: 2023-04-15
• Subjects: High-entropy ceramics -- Component design -- Energy storage performance -- Relaxor ferroelectrics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.12.073
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In recent years, "high-entropy" materials have attracted great attention in various fields due to their unique design concepts and crystal structures. The definition of high-entropy is also more diverse, gradually expanding from a single phase with an equal molar ratio to a multi-phase with a non-equimolar ratio. This study selected (Na0.2 Bi0.2 Ba0.2 Sr0.2 Ca0.2 )TiO3 high entropy ceramics with excellent relaxation behavior. The A-site elements are divided into ( x = Na, Bi, Ba) and ((1-3 x )/2 = Sr, Ca) according to their inherent properties. A novel ABO3 structural energy storage ceramics (NaBaBi) x (SrCa)(1-3 x )/2 TiO3 ( x = 0.19, 0.195, 0.2, 0.205 and 0.21) was successfully fabricated using the high entropy design concept. The ferroelectric and dielectric properties of non-equimolar ratio high-entropy ceramics were studied in detail. It was found that the dielectric constant of ∼4920 and the recoverable energy storage density of 3.86 J/cm 3 (at 335 kV/cm) can be achieved simultaneously at x = 0.205. The results indicate that the design concept of high-entropy materials with a non-equal molar ratio is an effective means to achieve distinguished energy storage performance in lead-free ceramics.