Enhanced energy storage performance of lead-free bismuth ferrite-strontium titanate multilayers via polarization spiral structures
Source abstract
Abstract
The quest for environmentally friendly lead-free dielectrics with exceptional energy storage performance poses a significant challenge. Here, we propose an alternative approach through a rational design of lead-free ferroelectric/paraelectric (BiFeO 3/SrTiO 3) multilayers. Utilizing the phase-field model, we demonstrate that the energy storage density and charge–discharge efficiency can be optimized by adjusting the volume fractions of BiFeO 3. A volume fraction of 0.69 BiFeO 3 yields the highest discharge energy storage density (58.01 J/cm 3) and near-perfect charge-discharge efficiency (99.8%) at 4 MV/cm. The multilayers exhibit varying hysteresis behaviors, from ferroelectric to relaxor to paraelectric-like characteristics, depending on the BiFeO 3 ratio. This study reveals that different polarization domain structures correspond to these behaviors, transitioning from stripe to spiral to in-plane patterns as the ferroelectric volume is reduced. Notably, the polarization spiral structure maintains excellent energy storage across temperatures up to 550 ∘C. These insights are crucial for developing high-performance dielectrics for electrical energy storage.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Multiferroics and related materials · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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