A review on different theoretical models of electrocaloric effect for refrigeration

Shao, Cancan; Амиров, А. А.; Huang, Houbing

doi:10.1007/s11708-023-0884-6

Cited by 6 publications

(2 citation statements)

References 181 publications

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“…This is why systems with controllable phase transitions are (in most cases) the most studied, since, in general, in this type of transition, the entropy variation of the system is maximized, which results in an increase in heat and consequently the possibility of further heating or cooling an external system more intensively [3,4]. Among these phenomena, the following effects stand out: magnetocaloric (MC) [5][6][7][8][9][10][11][12][13], electrocaloric (ELC) [14][15][16], elastocaloric (EC) [17,18], and barocaloric (BC) [19][20][21][22]. The first of these effects is due to changes in the external magnetic field on the system, the second due to changes in the electric field, the third due to changes in stress, and the last due to changes in pressure.…”

Section: Introductionmentioning

confidence: 99%

Caloric Effect Due to the Aharonov–Bohm Flux in an Antidot

Martínez-Rojas,

Benavides-Vergara,

Peña

et al. 2023

Nanomaterials

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In this work, we report the caloric effect for an electronic system of the antidot type, modeled by combining a repulsive and attractive potential (parabolic confinement). In this system, we consider the action of a perpendicular external magnetic field and the possibility of having an Aharonov–Bohm flux (AB-flux) generated by a current passing through a solenoid placed inside the forbidden zone for the electron. The energy levels are obtained analytically, and the model is known as the Bogachek and Landman model. We propose to control the caloric response of the system by varying only the AB-flux, finding that, in the absence of an external magnetic field, the maximization of the effect always occurs at the same AB-flux intensity, independently of the temperature, while fixing the external magnetic field at a non-zero value breaks this symmetry and changes the point where the caloric phenomenon is maximized and is different depending on the temperature to which the process is carried. Our calculations indicate that using an effective electron mass of GaAs heterostructures and a trap intensity of the order of 2.896 meV, the modification of the AB-flux achieves a variation in temperature of the order of 1 K. Our analysis suggests that increasing the parabolic confinement twofold increases the effect threefold, while increasing the antidot size generates the reverse effect, i.e., a strong decrease in the caloric phenomenon under study. Due to the great diversity in technological applications that have antidots in electronics, the possibility of controlling their thermal response simply by varying the intensity of the internal current inside the solenoid (i.e., the intensity of AB-flux) can be a platform of interest for experimental studies.

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Section: Introductionmentioning

confidence: 99%

Caloric Effect Due to the Aharonov–Bohm Flux in an Antidot

Martínez-Rojas,

Benavides-Vergara,

Peña

et al. 2023

Nanomaterials

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“…Recently, new materials exhibiting giant caloric effects of various nature have been actively investigated, due to their prospective applications as energy-efficient and environmentally friendly cooling systems based on solid-state cooling technologies [1][2][3][4][5][6][7][8]. In these materials, known as caloric, the adiabatic temperature change (∆T AD ) (isothermal entropy change (∆S) is observed at applied external stimuli (magnetic field, electric field, mechanical (uniaxial, isotropic) load).…”

Section: Introductionmentioning

confidence: 99%

Multicaloric Effect in 0–3-Type MnAs/PMN–PT Composites

Amirov,

Anokhin,

Talanov

et al. 2023

J. Compos. Sci.

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The new xMnAs/(1 − x)PMN–PT (x = 0.2, 0.3) multicaloric composites, consisting of the modified PMN–PT-based relaxor-type ferroelectric ceramics and ferromagnetic compound of MnAs were fabricated, and their structure, magnetic, dielectric properties, and caloric effects were studied. Both components of the multicaloric composite have phase transition temperatures around 315 K, and large electrocaloric (~0.27 K at 20 kV/cm) and magnetocaloric (~13 K at 5 T) effects around this temperature were observed. As expected, composite samples exhibit a decrease in magnetocaloric effect (<1.4 K at 4 T) in comparison with an initial MnAs magnetic component (6.7 K at 4 T), but some interesting phenomena associated with magnetoelectric interaction between ferromagnetic and ferroelectric components were observed. Thus, a composite with x = 0.2 exhibits a double maximum in isothermal magnetic entropy changes, while a composite with x = 0.3 demonstrates behavior more similar to MnAs. Based on the results of experiments, the model of the multicaloric effect in an MnAs/PMN–PT composite was developed and different scenario observations of multicaloric response were modeled. In the framework of the proposed model, it was shown that boosting of caloric effect could be achieved by (1) compilation of ferromagnetic and ferroelectric components with large caloric effects in selected mass ratio and phase transition temperature; and (2) choosing of magnetic and electric field coapplying protocol. The 0.3MnAs/0.7PMN–PT composite was concluded to be the optimal multicaloric composite and a phase shift ∆φ = −π/4 between applied manetic fields can provide a synergetic caloric effect at a working point of 316 K.

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