Scaling law for electrocaloric temperature change in antiferroelectrics

Lisenkov, S.; Mani, B. K.; Глазкова, Е. А.; Miller, Casey W.; Ponomareva, I.

doi:10.1038/srep19590

Cited by 21 publications

(24 citation statements)

References 22 publications

(44 reference statements)

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“…53 Indeed, recent firstprinciples calculations predicted the existence of a so-called scaling law of DT for the fields below E AFE-FE in PbZrO 3 . 54 However, the computational results failed to reproduce several typical experimental behaviors: 29,32 the remarkable shift of polarization peak with temperature under various electric fields, the shift of negative DT peak with temperature under various electric fields, and the sign reversal under ultrahigh electric fields. In addition, relaxor ferroelectics were also found to display a modest negative electrocaloric effect in a limited temperature range, which will be discussed in Section II D. The potential interest for negative electrocaloric or magnetocaloric effect is not only to develop a new class of caloric materials in solid-state caloric family but also to enhance the cooling efficiency if both negative and positive caloric effects can be combined properly.…”

Section: Negative Electrocaloric Effect In Antiferroelectricsmentioning

confidence: 93%

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Liu

Scott

Dkhil

2016

Applied Physics Reviews

221

150

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It has been ten years since the discovery of the giant electrocaloric effect in ferroelectric materials showed that it is possible to employ this effect for substantial cooling applications. This last decade has been marked by increasing research interest, especially in characterizing and measuring the electrocaloric effect using both the so-called indirect and direct approaches. In this context, a comprehensive summary and careful reexamination of these approaches are very timely and of great importance to justify the assumptions used in different measurement techniques. This review is therefore dedicated to cover recent important and rapid advances from both the indirect and direct measurements and provides critical insights relevant for quantifying the electrocaloric effect. It involves electrocaloric materials from normal ferroelectrics, antiferroelectrics, and relaxors, and it fundamentally focuses on how the electrocaloric entropy changes in response to electric field in these typical electrocalorics. The article addresses recent developments, especially during the past three years, such as technical selection of proper polarization-electric field loops, negative electrocaloric effect in antiferroelectrics and relaxors, the controversial debate on the indirect method in relaxors, the important role of field dependence of specific heat, kinetic factors, and so on. Moreover, this review also is concerned with extracting reliable data by direct measurements. Four typical techniques and devices used recently, such as thermocouples, differential scanning calorimeters, specifically designed calorimeters, and scanning thermal microscopy, are briefly reviewed, while infrared cameras are emphasized. We hope that our review will not only provide a useful background to understand fundamentally the electrocaloric effect and what one really measures but also may act as a practical guide to exploit and develop electrocalorics towards the design of suitable devices. Published by AIP Publishing. [http://dx

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Section: Negative Electrocaloric Effect In Antiferroelectricsmentioning

confidence: 93%

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Liu

Scott

Dkhil

2016

Applied Physics Reviews

221

150

View full text Add to dashboard Cite

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“…55 For instance, the existence of a scaling law for ∆T E was recently revealed in antiferroelectrics 56 using ab initio calculations. In addition, the magnitude of the negative effect is relatively smaller than its positive counterpart underlining the need to pursue more effort into the understanding of the negative electrocaloric effect.…”

Section: 3mentioning

confidence: 99%

Some strategies for improving caloric responses with ferroelectrics

2016

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Many important breakthroughs and significant engineering developments have been achieved during the past two decades in the field of caloric materials. In this review, we address ferroelectrics emerging as ideal materials which permit both giant elastocaloric and/or electrocaloric responses near room temperature. We summarize recent strategies for improving caloric responses using geometrical optimization, maximizing the number of coexisting phases, combining positive and negative caloric responses, introducing extra degree of freedom like mechanical stress/pressure, and multicaloric effect driven by either single stimulus or multiple stimuli. This review highlights the promising perspective of ferroelectrics for developing next-generation solid-state refrigeration.

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“…For example, AFEs were found to exhibit a negative ECE, [29][30][31][32] which is highly desirable for cooling applications because combining positive and negative ECE yields higher cooling efficiency. For example, AFEs were found to exhibit a negative ECE, [29][30][31][32] which is highly desirable for cooling applications because combining positive and negative ECE yields higher cooling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Electrocaloric Potential of Antiferroelectrics with Phase Competition

Kingsland

Lisenkov

Ponomareva

2018

Advcd Theory and Sims

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Currently, the electrocaloric effect (ECE) is considered for applications in solid-state refrigeration. Direct semi-classical first-principles-based simulation to the case of ultra-thin PbZrO 3 films in order to unveil the unusual electrocaloric potential of antiferroelectrics with phase competition are applied. Strong enhancement of the ECE in the vicinity of the antiferroelectric-ferroelectric phase transition, the coexistence of electric-field tunable positive and negative ECE in antiferroelectrics, and a large ECE in the vicinity of lossless antipolar-polar phase transitions are predicted. Direct simulations demonstrate that phase switching, which occurs with hysteretic losses, gives rise to the irreversible heating which is explained using basic thermodynamics. A refrigeration cycle that tames the irreversible heating is proposed, tested in direct simulations, and found to outperform the conventional cycle based on fully reversible processes. Furthermore, direct simulations reveal critical misconceptions in the application of the controversial indirect approach to the case of ferroics with electric hysteresis. The route to overcoming the uncertainties with this dominant ECE investigation approach is proposed.

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Scaling law for electrocaloric temperature change in antiferroelectrics

Cited by 21 publications

References 22 publications

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Some strategies for improving caloric responses with ferroelectrics

Unveiling Electrocaloric Potential of Antiferroelectrics with Phase Competition

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