Abstract
Substantial attention for dielectric ceramic capacitors toward lead-free has been driven by the enhanced awareness of environmental protection. However, the unsatisfying breakdown strength (E_b) and comparatively low efficiency (η) becomes an obstacle for their widespread application. Here, environment-friendly lead-free relaxor ferroelectric (1-x) (0.67BiFeO_3-0.33Ba_(0.8)Sr_(0.2)TiO_3) -xSr_(0.7)La_(0.2)TiO_3 + 0.1 wt% MnO_2 (BFO-BST-SLT) ceramic is reported as an efficient route to possess excellent E_b and high r\ simultaneously. The doping of SLT can significantly suppress the grain growth, improve the relaxation behavior, and thus increasing the E_b and η of the ceramics. Consequently, the corresponding ceramics with x = 0.3 achieves good discharged energy density of -2.55 J/cm~3 and ultrahigh η of -92%. Notably, it presents outstanding charging/discharging performances with fast charging/discharging time (-0.0266 μs), power density (-28.11 MW/cm~3) along with current density (-468.5 A/cm~2). Together with great temperature stability, frequency stability and cycle stability, this contributes provides a crucial way to prepare lead-free dielectrics for next-generation pulsed power capacitor applications.
NSTL
Elsevier