Lead-free X8R-type 0.92Ba0.8Sr0.2TiO3-0.08Bi(Mg0.5Zr0.5)O3 dielectric energy-storage ceramics for pulsed power capacitors

Structurally Regulated Design Strategy of Bi0.5Na0.5TiO3-Based Ceramics for High Energy-Storage Performance at a Low Electric Field

“…The comprehensive energy-storage characteristic of 0.96 (0.7BNT-0.3ST)-0.04 SZN is superior to those of the reported BNT-based ceramics ,− with an excellent energy-storage performance at a low electric field of 290 kV/cm. Figure a shows that the W rec of 0.96 (0.7BNT-0.3ST)-0.04 SZN is higher than those of the reported lead-free energy-storage ceramics under similar electric fields (280–310 kV/cm). ,,− The reported W rec values of lead-free ceramics can reach up to 7–8 J/cm 3 under an applied electric field strength of >400 kV/cm (Figure b). − However, the W rec values of 0.96 (0.7BNT-0.3ST)-0.04 SZN reach 7.43 ± 0.05 J/cm 3 under an electric field strength of 290 kV/cm. Moreover, 0.96 (0.7BNT-0.3ST)-0.04 SZN has excellent temperature and frequency energy-storage stability and good charge–discharge properties ( P D ∼ 74 ± 1 MW/cm 3 and τ 0.9 ∼ 159 ± 2 ns) (Figures S2 and S4).…”

“…(a) Comparison of W rec under similar electric fields strength (280–310 kV/cm) ,,− and (b) electric field strength required for similar W rec (7–8 J/cm 3 ) values for 0.96 (0.7BNT-0.3ST)-0.04 SZN ceramic and reported lead-free energy-storage ceramics. − …”

“…The coexistence of local phases is an effective method to enhance energy-storage properties . The structural characteristics are the key factors influencing E b . − E b was improved primarily by optimizing the sintering method − and adding appropriate dopants. − However, spark plasma sintering is not suitable for broad applications. Appropriate dopants were selected to effectively inhibit grain growth and obtain a dense and uniformly sized microstructure.…”