High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics

Journal article

An increasing number of new dielectrics are being reported for the development of next-generation ceramic capacitors for power electronics used in clean energy technologies. Here, high discharge energy density (W_dis) ~6.1 J cm⁻³ with efficiency (η)~72% under a pulsed field (E_max) of 410 kV cm⁻¹ is reported along with temperature stability up to 150 °C (E_max = 200 kV cm⁻¹) for 0.5 K_0.5Bi_0.5TiO₃-0.42BiFeO₃-0.08Sm(Mg_2/3Nb_1/3)O₃ (KBT-BF-SMN) bulk ceramics. The optimised composition is chemically heterogeneous but electrically homogenous, similar to several BiFeO₃-based dielectrics reported previously and adding to the growing body of evidence that electrical (measured at weak-field) not chemical homogeneity is the best guide to increased E_max and enhanced energy density. KBT-BF-SMN ceramics are therefore considered as promising candidates for pulsed power and power electronics applications.

Authors: Wang, X; Fan, Y; Zhang, B; Mostaed, A; Li, L

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Journal of the European Ceramic Society
• Volume: 42
• Issue: 15
• Pages: 7381-7387
• Publication date: 2022-08-10
• Acceptance date: 2022-08-08
• DOI: 10.1016/j.jeurceramsoc.2022.08.020
• ISSN: 0955-2219
• Language: English
• Keywords: energy density; dielectrics; FFR; power electronics; ceramic capacitors; bismuth ferrite