Relaxor properties and breakdown strength of Ta doped Sr0.7Bi0.2TiO3-based lead-free ceramics for energy storage applications
Source abstract
Abstract
Ferroelectric ceramic capacitors show great potential in pulse power devices for their fast charging-discharging characteristics and immense power density. As a relaxation ferroelectric material, Sr0.7Bi0.2TiO3 has the advantage of high energy storage efficiency. Nevertheless, its low breakdown strength limits its energy storage performance. Herein, Sr0.7Bi0.2Ti(1–1.25x)TaxO3 (SBT-T) ceramics were synthesized by introducing Ta2O5 with a broad bandgap. On the one hand, the B-site ion disorder enhanced the relaxor behavior of the SBT-T ceramics. On the other hand, the introduction of Ta boosted the impedance and activation energy of the SBT-T ceramics, thus significantly improving their breakdown strength. With the increase in Ta content, the critical electric fields of SBT-T ceramics were monotonically increased from 240 to 370 kV/cm (increased by 54%), and splendid Wrec = 2.33 J/cm3 and high η = 91.76% were achieved when x = 0.04 under 290 kV/cm. Additionally, the SBT-0.04T ceramics demonstrated excellent pulse charge–discharge speed (t0.9 of 81.69 ns) and power density (PD of 153.39 MW/cm3). This research revealed that Ta doping was an effective approach to strengthening breakdown strength, which might provide ideas for improving the energy storage performance of dielectric capacitors.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Dielectric properties of ceramics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (52)
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