Abstract
In order to meet the production requirements of high performance lead-free dielectric capacitor, the linear material CaTiO3 (CT) was introduced into 0.9NaNbO3−0.1Ba(Mg1/3Ta2/3)O3 ceramics. The energy storage performance and structural mechanism of (1-x)[0.9NaNbO3−0.1Ba(Mg1/3Ta2/3)O3]–xCaTiO3(x = 0.05, 0.10, 0.15, and 0.20) ceramics were studied. Dense ceramics with high bulk density were prepared by traditional solid-state sintering method, and high recoverable energy density Wrec ∼ 5.84 J/cm3 and high energy storage efficiency η ∼ 85.4 % were obtained at x = 0.15. In this study, the Wrec and η of 0.9NN–0.1BMT ceramics were improved by introducing a linear material CT to increase the maximum polarization Pm (29 μC/cm2) and suppress the early nonlinear polarization saturation, and a large breakdown strength Eb (520 kV/cm) was obtained by optimizing the domain structure. In addition, under the applied electric field of 20 kV/mm, it has ultra-fast discharge speed t0.9 (28.9 ns), large discharge energy density Wd (1.02 J/cm3), ultra-high current density CD (863.4 A/cm2), and high-power density PD (86.34 MW/cm3). The above shows that NaNbO3-based relaxor ferroelectric ceramics are expected to be used in high-power electronic devices.
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