Electromagnetic-driven electrocaloric cooling device based on ternary ferroelectric composites

Kang, Xilong; Jia, Shuhai; Peng, Jun; Yu, Hongqiang; Zhou, Xing

doi:10.1016/j.compositesb.2021.109391

Cited by 9 publications

(6 citation statements)

References 46 publications

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“…Aiming at the close relationship between polarization and the pyroelectric effect, the ECE was first measured using x = 0.05 as an example owing to its highest piezoelectricity, to understand the process of polarization changes under both electric field and temperature. The ECE is the process of heat absorption or release through the phase change and dipole entropy change of ferroelectrics induced by an electric field 33–35 . Figure 6A shows a schematic of the ECE at the micro‐level.…”

Section: Resultsmentioning

confidence: 99%

“…The ECE is the process of heat absorption or release through the phase change and dipole entropy change of ferroelectrics induced by an electric field. [33][34][35] Figure 6A shows a schematic of the ECE at the micro-level. In the absence of an applied electric field, the direction of spontaneous polarization in ferroelectric materials is chaotic and disordered.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

et al. 2022

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Achieving excellent pyroelectric performance remains a challenge for lead‐free piezoelectric ceramics. To meet the requirements of both an enhanced pyroelectric coefficient at room temperature and good thermal stability during the encapsulation of pyroelectric devices, (1–x)K0.48Na0.52NbO3–xBi0.5Ag0.5ZrO3–0.2%Fe2O3 (KNN–BAZ–Fe) lead‐free ferroelectric ceramics with high Curie temperatures were prepared to obtain improved pyroelectric performance via the coexistence of multiple symmetries. The variation of BAZ content led to the formation of rhombohedral–orthorhombic–tetragonal phase boundary and promoted grain growth, resulting in the best pyroelectric coefficient (p = 5.09 × 10−4 C m−2°C−1) and enhanced figures of merit (Fi = 0.2084 × 10−9 (m V−1), Fv = 0.0142 m2 C−1, Fd = 0.0947 × 10−4 Pa−1/2, and Fe = 17.66 J m−3 K−2) for infrared (IR) detection when x = 0.05. The room‐temperature pyroelectric coefficient obtained in this study is approximately four times that of the pure KNN ceramic and is the maximum value reported for niobate‐based piezoelectric ceramics. Moreover, compared with the poor thermal stability of barium titanate‐ and bismuth sodium titanate‐based ceramics because of their ultralow Curie temperature or thermal depolarization temperature, the ceramics investigated here exhibit much better thermal stability because of their high Curie temperature (TC > 300°C) and diffused phase‐transition behavior, making them more adaptable for practical applications. These results suggest that KNN–xBAZ–Fe ceramics are attractive candidates for applications in the field of IR sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

et al. 2022

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“…7,8 The materials studied for electrocaloric refrigeration so far mainly include single crystals, thin films, polymers, and the conventional ferroelectric ceramics. [9][10][11][12][13] Among them, thin films and polymers necessitate the application of exceedingly high external electric fields for activation. However, the conventional ferroelectric ceramics especially lead-based ceramics are harmful to environmental and health risks due to their substantial lead content.…”

Section: Introductionmentioning

confidence: 99%

“…The basic principle of the electrocaloric effect is that the internal polarization state of the polar materials normally changes with the change of the external electric field (Figure 1A), which causes the variation of the internal polarization as well as the adiabatic temperature of the material itself 7,8 . The materials studied for electrocaloric refrigeration so far mainly include single crystals, thin films, polymers, and the conventional ferroelectric ceramics 9–13 . Among them, thin films and polymers necessitate the application of exceedingly high external electric fields for activation.…”

Section: Introductionmentioning

confidence: 99%

Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains

Feng,

Hao,

et al. 2024

J Am Ceram Soc.

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A large adiabatic temperature change along with a wide operating temperature region is usually required for the electrocaloric materials to fulfill their refrigeration function. In general, doping foreign ions into BaTiO3 is the frequently utilized strategy in order to obtain excellent electrocaloric materials for the practical application. In the current paper, BaTiO3 lead‐free ferroelectric ceramics were doped by Ca2+ and Sn4+ simultaneously in order to generate a coexistence state at room temperature, where ferroelectric domains and nanodomains exit. As a result, a large polarization and a wide operating temperature range were finally induced. It is found that Ba0.9Ca0.1Ti0.85Sn0.15O3 has a maximum adiabatic temperature change of 0.85 K and an excellent working temperature region (65 K, ∆T > 90% Tmax) was achieved under an electric field of 50 kV/cm. The above phenomenon indicates that the modified BaTiO3 ceramics can be a good potential electrocaloric material in the state of cross‐existence of ferroelectric domains and nanodomains.

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“…(B) Measured maximum cooling power in each year. Data were taken from(11,12,15,(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51).…”

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confidence: 99%

High cooling performance in a double-loop electrocaloric heat pump

Li,

Torelló,

Kovacova

et al. 2023

Science

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Cooling through solid-state electrocaloric materials is an attractive replacement for vapor compression. Despite recent efforts, devices that are potentially commercially competitive have not been developed. We present an electrocaloric cooler with a maximum temperature span of 20.9 kelvin and a maximum cooling power of 4.2 watts under the moderate applied electric field of 10 volts per micrometer without any observed breakdown. Moreover, the maximum coefficient of performance, even taking into account energy expended on fluid pumping, reaches 64% of Carnot’s efficiency as long as energy is properly recovered. We believe that this demonstration shows electrocaloric cooling to be a very promising alternative to vapor compression cooling.

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Electromagnetic-driven electrocaloric cooling device based on ternary ferroelectric composites

Cited by 9 publications

References 46 publications

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains

High cooling performance in a double-loop electrocaloric heat pump

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