Dynamic characterization of pulse discharge behavior of Sr 1-x Ca x TiO 3 ceramics through RLC circuit

Abstract

A direct correlation between microstructural evolution and macroscopic pulsed discharge behavior is established in Sr 1-x Ca x TiO 3 (x=0-1.0) ceramics through this research, departing from conventional polarization-breakdown models employed for theoretical energy density estimation. Instead, we propose an in-situ discharge parameter analysis to evaluate practical energy storage/release efficiency. Calcium doping dynamically regulates discharge kinetics by tailoring lattice distortion and interfacial charge transport: At x=0.5, the underdamped oscillation peak current increase from 21.3 A (x=0) to 27 A, with overdamped energy density reaching 0.83 J/cm 3 and discharge rate (W d /t 0.9 ) increasing by 142%. Temperature-dependent tests (20-120°C) reveal minimal energy density drift for CaTiO 3 (x=1.0, ΔW d /W d0 =5.8%) and Sr 0.5 Ca 0.5 TiO 3 (x=0.5, 7.3%), outperforming SrTiO 3 (x=0, 14.2%). By directly linking discharge parameters (current density, energy density, thermal drift) to microstructural features, this work pioneers a performance evaluation paradigm for dielectric ceramics beyond traditional polarization-breakdown calculations.