Large energy density and high efficiency achieved simultaneously in Bi(Mg0.5Hf0.5)O3-modified NaNbO3 ceramics

• Published in: Results in physics 2023-01, Vol.44, p.106194, Article 106194
• Main Authors: Zhang, Siyuan, Li, Wenhua, Zhang, Yansong, Tang, Xingui, Jiang, Yanping, Guo, Xiaobin
• Format: Article
• Language: English
• Subjects: Charging-discharging; Energy storage performances; NN-BMH ceramics; Relaxor ferroelectrics
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2022.106194

•NN-0.20BMH ceramic achieved large Wrec of 3.51 J/cm3 and an η of 93.77 %.•NN-0.20BMH ceramics displayed high power density (PD = 118 MW/cm3).•NN-0.20BMH ceramics displayed large current density (CD = 990 A/cm2).•NN-0.20BMH ceramics show excellent stability of frequency and temperature. A novel lead-free relaxor ferroelectric ceramics, (1-x)NaNbO3-xBi(Mg0.5Hf0.5)O3[NN-xBMH, x  = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25] were designed and fabricated for the first time via the standard solid-phase reaction method. The dielectric, ferroelectric, and impedance properties of the NN-xBMH ceramics were tested. Normal ferroelectrics were induced into relaxor ferroelectrics with the introduction of BMH, and the hysteresis loops became slender; This is beneficial to improve the energy storage density and efficiency of ceramic capacitors. Superior breakdown strength (370 kV/cm) is achieved in NN-0.20BMH ceramic with the recoverable energy storage density (Wrec = 3.51 J/cm3) and efficiency (η = 93.77 %). In addition, excellent frequency (1–1000 Hz) and temperature (30–120 °C) stability shows that ceramics have the actual potential in the application of ceramic capacitor.Excellent charge and discharge performances with a high power density (PD = 118 MW/cm3) and current density (CD = 990 A/cm2) along with an ultra-fast discharge rate (50 ns) were gained.