J. Mater. Sci. Technol. ›› 2023, Vol. 145: 66-73.DOI: 10.1016/j.jmst.2022.10.053

• Research Article • Previous Articles     Next Articles

Enhanced capacitive energy storage and dielectric temperature stability of A-site disordered high-entropy perovskite oxides

Yating Ninga, Yongping Pua,*, Chunhui Wua, Shiyu Zhoua, Lei Zhanga, Jinbo Zhanga, Xian Zhanga, Yangchao Shangb   

  1. aSchool of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China;
    bSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi'an 710021, China
  • Received:2022-09-05 Revised:2022-10-09 Accepted:2022-10-18 Published:2023-05-10 Online:2022-12-08
  • Contact: * E-mail address: labelectroceramic@sust.edu.cn (Y. Pu).

Abstract: In this work, a novel high entropy perovskite oxide (1-x)(Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3-xNaNbO3 (abbreviated as (1-x)NBBSCT-xNN, x = 0, 0.05, 0.1, 0.15, and 0.2) was designed to improve temperature dielectric stability and energy storage performance by combining relaxor and antiferroelectric characteristics. The optimal composition of x = 0.2 exhibits a high energy storage density of 3.51 J/cm3, together with wide temperature stable stability ($\frac{C_T-C_{25^{\circ} \mathrm{C}}}{C_{25^{\circ} \mathrm{C}}}$< 15%, -70 to 110 °C), excellent frequency stability (Wrec and η vary by only ± 2.1% and ± 5.2% within the range of 1-600 Hz) and fast discharge rate (t0.9 = 55.2 ns). This is mainly due to the enhancement of relaxation behavior and increase of Eb caused by the decrease of grain size. These results offer a new strategy for designing high entropy ceramic materials of high performance in the future.

Key words: Energy storage, High-entropy perovskite, Temperature stability, Relaxor ferroelectrics