AI Article Synopsis
- Relaxor ferroelectrics are essential for pulse-power dielectric capacitors, but improving energy density often reduces energy efficiency in high fields.
- This study introduces a new high-entropy ceramic made from a mix of ferroelectric cations, which creates a unique dipole structure that enhances energy density and efficiency.
- The resulting materials achieved impressive recoverable energy densities (up to ~26.3 J/cm³) with high efficiency and stability for use in multilayer ceramic capacitors.
Article Abstract
Relaxor ferroelectrics are highly desired for pulse-power dielectric capacitors, however it has become a bottleneck that substantial enhancements of energy density generally sacrifice energy efficiency under superhigh fields. Here, we demonstrate a novel concept of highly polarizable concentrated dipole glass in delicately-designed high-entropy (BiBaNa)(FeTiNb)O ceramic achieved via substitution of multiple heterovalent ferroelectric-active principal cation species on equivalent lattice sites. The atomic-scaled polar heterogeneity of dipoles with different polar vectors between adjacent unit cells enables diffuse reorientation process but disables appreciable growth with electric fields. These unique features cause superior recoverable energy density of ~15.9 J cm and efficiency of ~93.3% in bulk ceramics. We also extend the highly polarizable concentrated dipole glass to the prototype multilayer ceramic capacitor, which exhibits record-breaking recoverable energy density of ~26.3 J cm and efficiency of ~92.4% with excellent temperature and cycle stability. This research presents a distinctive approach for designing high-performance energy-storage dielectric capacitors.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11347673 | PMC |
| http://dx.doi.org/10.1038/s41467-024-51766-z | DOI Listing |
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