Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films

Liu, Yang; Wei, Jie; Lou, Xiaojie; Bellaïche, L.; Scott, J. F.; Dkhil, Brahim

doi:10.1063/1.4906198

Cited by 18 publications

(19 citation statements)

References 49 publications

(81 reference statements)

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“… and in several materials including ferroelectrics and antiferroelectrics. Phenomenological calculations on BaTiO 3 ‐based capacitors and thin films by Liu et al . yield inverse elastocaloric responses under compressive stress (below certain critical magnitude) applied along [001] to the tetragonal phase.…”

Section: Discussionmentioning

confidence: 99%

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Origins of the Inverse Electrocaloric Effect

Grünebohm

Marathe

et al. 2018

Energy Tech

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The occurrence of the inverse (or negative) electrocaloric effect, where the isothermal application of an electric field leads to an increase in entropy and the removal of the field decreases the entropy of the system under consideration, is discussed and analyzed. Inverse electrocaloric effects have been reported to occur in several cases, for example, at transitions between ferroelectric phases with different polarization directions, in materials with certain polar defect configurations, and in antiferroelectrics. This counterintuitive relationship between entropy and applied field is intriguing and thus of general scientific interest. The combined application of normal and inverse effects has also been suggested as a means to achieve larger temperature differences between hot and cold reservoirs in future cooling devices. A good general understanding and the possibility to engineer inverse caloric effects in terms of temperature spans, required fields, and operating temperatures are thus of fundamental as well as technological importance. Here, the known cases of inverse electrocaloric effects are reviewed, their physical origins are discussed, and the different cases are compared to identify common aspects as well as potential differences. In all cases the inverse electrocaloric effect is related to the presence of competing phases or states that are close in energy and can easily be transformed with the applied field.

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Section: Discussionmentioning

confidence: 99%

“…The authors proposed the caloric cycle concept of combining the tensile and appropriate compressive stress to take advantage of conventional and inverse elastocaloric effect similar to that explained in Section 4.3 . Furthermore, they reported that the elastocaloric response depends crucially on epitaxial strain …”

Section: Discussionmentioning

confidence: 99%

Origins of the Inverse Electrocaloric Effect

Grünebohm

Marathe

et al. 2018

Energy Tech

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“…Multicaloric effect may also lead to search for hitherto unobserved caloric effect in ferroics 5 (e.g., elastocaloric effects in ferroelectrics 18,20,60 ) or tuning and optimizing of one single caloric effect in multiferroic materials by using a non-conjugated field (e.g., electrocaloric effect with stress 21 ). Elastocaloric properties in bulk 20,60 and thin films 18,61 ferroelectrics were predicted to be remarkable and comparable with those of martensites, 62,63 expanding the elastocaloric family. Interestingly, the mechanism of elastocaloric effect in thin films purely stems from the continuous changes of the strain, which differs from that in shape-memory alloys 3 and ferroelectric bulk.…”

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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“…The stimulus-mediated caloric effect has attracted much more attention since the additional stimulus applied on the samples may help to optimize the caloric properties such as the tuning of phase transition temperature (thus the working temperature) and to modify the largest caloric response. [24][25][26][27]31] A typical result is shown in Fig. 4.…”

Section: Insights Into the Multicaloric Effect In Normal Ferroelectricsmentioning

confidence: 99%

“…[6] Among the ferroic materials ferroelectrics can be good potential candidates for developing multicaloric effect, due to the fact that the phase transition in ferroelectrics can be triggered by electric field, uniaxial stress and hydrostatic pressure. [7] According to the literature, individual caloric effects such as electrocaloric, [8][9][10][11][12][13][14][15][16][17][18][19][20] elastocaloric [21][22][23][24][25][26][27][28] and barocaloric [28][29][30][31][32][33] scenarios have all been reported in ferroelectric materials. In this context only a few theoretical studies have been published to understand the multicaloric effect in ferroelectric bulk and thin films driven by simultaneous application of electric and mechanical fields.…”

Section: Introductionmentioning

confidence: 99%

Towards multicaloric effect with ferroelectrics

Liu

Zhang

et al. 2016

Phys. Rev. B

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Utilizing thermal changes in solid state materials strategically offers caloric-based alternatives to replace current vapor-compression technology. To make full use of multiple forms of the entropy and achieve higher efficiency for designs of cooling devices, the multicaloric effect appears as a cutting-edge concept encouraging researchers to search for multicaloric materials with outstanding caloric properties. Here we report the multicaloric effect in BaTiO 3 single crystals driven simultaneously by mechanical and electric fields and described via a thermodynamic phenomenological model. It is found that the multicaloric behavior is mainly dominated by the mechanical field rather than the electric field, since the paraelectric-toferroelectric transition is more sensitive to mechanical field than to electric field. The use of uniaxial stress competes favorably with pressure due to its much higher caloric strength and negligible elastic thermal change. It is revealed that multicaloric response can be significantly larger than just the sum of mechanocaloric and electrocaloric effects in temperature regions far above the Curie temperature but cannot exceed this limit near the Curie temperature. Our results also show the advantage of the multicaloric effect over the mechanically-mediated electrocaloric effect or electrically-mediated mechanocaloric effect. Our findings therefore highlight the importance of ferroelectric materials to develop multicaloric cooling.2

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Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films

Abstract: Articles you may be interested inEnhanced microwave dielectric tunability of Ba0.5Sr0.5TiO3 thin films grown with reduced strain on DyScO3 substrates by three-step technique

Cited by 18 publications

References 49 publications

Origins of the Inverse Electrocaloric Effect

Origins of the Inverse Electrocaloric Effect

Some strategies for improving caloric responses with ferroelectrics

Towards multicaloric effect with ferroelectrics

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