Microstructure effects on the energy storage density in BiFeO3-based ferroelectric ceramics
Source abstract
Abstract
Abstract Lead-free BiFeO3–BaTiO3–Bi(Mg2/3Nb1/3)O3 (BFBT-BMN) ceramics with different grain sizes were fabricated by using a conventional solid-state reaction. The high-energy ball milling technique was utilized to obtain the fine-grained ceramics. The grain size reduction lowers the remanent polarization (Pr) and enhances the dielectric breakdown strength (Eb) leading to a drastic increase of the recoverable energy storage density (Wre). For the fine-grained BFBT-BMN ceramics, Wre greatly increases by 8 times from 0.16 J/cm3 to 1.27 J/cm3, compared to the coarse-grained BFBT-BMN ceramics. Transmission electron microscopy (TEM) and piezo-response force microscopy (PFM) measurements revealed the occurrence of the polar nanoregions (PNRs) in the fine-grained BFBT-BMN ceramics. The dynamic and weakly correlated PNRs structure is responsible for the enhancement of recoverable energy storage density in the fined-grained BFBT-BMN ceramics. This work indicates that the grain size reduction is an effective way to modify the energy storage properties of BiFeO3-based ferroelectric ceramics.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Multiferroics and related materials · Dielectric materials and actuators
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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