Tailoring the Electrocaloric Effect by Internal Bias Fields and Field Protocols

Ma, Yang-Bin; Xu, Boyang; Albe, Karsten; Grünebohm, Anna

doi:10.1103/physrevapplied.10.024048

Cited by 13 publications

(6 citation statements)

References 58 publications

(78 reference statements)

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“…A depolarization field (E d ) exists near electrodes or FE domain walls if the polarization-induced bound charges are not fully compensated [21,22]. Presumably, the interface between the polar FE phase and the nonpolar AFE phase should also be a location bearing E d .…”

Section: B E D Assisted Afe To Fe Phase Transitionmentioning

confidence: 99%

Interaction Dynamics Between Ferroelectric and Antiferroelectric Domains in a PbZrO3 -Based Ceramic

et al. 2019

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The antiferroelectric-ferroelectric phase transition in PbZrO3-based oxides is of both fundamental and practical importance. In ceramics in which such a transition readily occurs, the antiferroelectric and the ferroelectric phases often coexist in individual grains with a coherent interphase interface. In this work, the electric biasing in situ transmission electron microscopy technique is employed to directly observe a unique microstructural dynamic when ferroelectric and antiferroelectric domains are driven by a moderate electric field to interact. It is found that, under monotonic loading, the ferroelectric domain grows until it is blocked by the ferroelectric-antiferroelectric interface. At the same time, a kink is formed on the interface at the contact point. The interaction of the growing domain with the interface is interpreted in terms of depolarization field-assisted phase transition, which is supported by our phase-field simulation. Upon further bipolar cycling, the ferroelectric domain becomes less mobile and no longer reaches the ferroelectricantiferroelectric interface, indicative of electric fatigue of the ferroelectric phase. Disciplines Ceramic Materials | Engineering Physics | Materials Science and Engineering Comments This article is published as Fan, Zhongming, Fei Xue, Goknur Tutuncu, Long-Qing Chen, and Xiaoli Tan. "Interaction Dynamics Between Ferroelectric and Antiferroelectric Domains in a PbZrO3-Based Ceramic."

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Section: B E D Assisted Afe To Fe Phase Transitionmentioning

confidence: 99%

Interaction Dynamics Between Ferroelectric and Antiferroelectric Domains in a PbZrO3 -Based Ceramic

et al. 2019

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“…The effect of bias electric or magnetic fields have previously been considered in a few caloric materials. The effect of an internal bias electric field has been examined in an analytical Landau model of an electrocaloric material [72]. The effect of a biasing external magnetic field 425 has been considered for direct (induction-based) TMG cycles on a Heusler alloy with a first order magnetostructural transition, with the motivation of converting as much magnetic work into electricity as possible [73].…”

Section: Soft Ferromagnets Biased By a Hard Magnetmentioning

confidence: 99%

Hard ferromagnets as a new perspective on materials for thermomagnetic power generation cycles

et al. 2023

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“…The effect of bias electric or magnetic fields have previously been considered in a few caloric materials. The effect of an internal bias electric field has been examined in an analytical Landau model of an electrocaloric material [72]. The effect of a biasing external magnetic field has been considered for direct (induction-based) TMG cycles on a Heusler alloy with a first order magnetostructural transition, with the motivation of converting as much magnetic work into electricity as possible [73].…”

Section: Soft Ferromagnets Biased By a Hard Magnetmentioning

confidence: 99%

Hard Ferromagnets as a New Perspective on Materials for Thermomagnetic Power Generation Cycles

Tantillo,

Barcza,

Zellmann

et al. 2023

Preprint

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We consider the ways in which magnetically hard materials can be used as the working materials in thermomagnetic power generation (TMG) cycles in order to expand the area in the magnetisation vs. applied field (M − H) plane available for energy conversion. There are 3 parts to this Perspective. First, experiments on commercially available hard ferrites reveal that, while these materials are not yet good TMG candidates, hard ferromagnets with higher thermal conductivity and a greater change of magnetization with temperature could outperform existing TMG materials. Second, computational results indicate that biasing a soft magnet with a hard ferromagnet is essentially equivalent to shifting the M − H loop by an amount proportional to the field of the biasing magnet. Work outputs under biased conditions show a substantial improvement over unbiased cycles, but experimental verification is needed. Third, we discuss the rationale for exploring artificial spin reorientation materials as novel TMG working materials.

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Tailoring the Electrocaloric Effect by Internal Bias Fields and Field Protocols

Cited by 13 publications

References 58 publications

Interaction Dynamics Between Ferroelectric and Antiferroelectric Domains in a PbZrO3 -Based Ceramic

Interaction Dynamics Between Ferroelectric and Antiferroelectric Domains in a PbZrO3 -Based Ceramic

Hard ferromagnets as a new perspective on materials for thermomagnetic power generation cycles

Hard Ferromagnets as a New Perspective on Materials for Thermomagnetic Power Generation Cycles

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