Effects of uniaxial compressive stress on the electrocaloric effect of ferroelectric ceramics

Cheng, Xiangyang; Li, Yingwei; Zhu, Dapeng; Li, Meiya; Feng, Min

doi:10.1007/s10853-020-04640-4

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…could be attributed to the temperature-induced MT in the non-isothermal PFM simulation, i.e., the relatively large temperature increase at high stress could in turn remarkably hinder the austenite-martensite transition and thus lower the temperature [85]. Cheng et al [86] also report the similar phenomena in electrocaloric effect. In addition, ∆T ad /σ max is usually utilized as a parameter to evaluate the field normalized caloric effect, also known as the specific adiabatic temperature [87].…”

Section: Indirect Vs Direct Methodsmentioning

confidence: 88%

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Tang¹,

Yang²,

Xu³

et al. 2023

Preprint

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Modelling elastocaloric effect (eCE) is crucial for the design of environmentally friendly and energy-efficient eCE based solid-state cooling devices. Here, a thermodynamically consistent non-isothermal phase-field model (PFM) coupling martensitic transformation with mechanics and heat transfer is developed and applied for simulating eCE. The model is derived from a thermodynamic framework which invokes the microforce theory and Coleman-Noll procedure. To avoid the numerical issue related to the non-differentiable energy barrier function across the transition point, the austenite-martensite transition energy barrier in PFM is constructed as a smooth function of temperature. Both the indirect method using isothermal PFM with Maxwell relations and the direct method using non-isothermal PFM are applied to calculate the elastocaloric properties. The former is capable of calculating both isothermal entropy change and adiabatic temperature change (∆T ad ), but induces high computation cost. The latter is computationally efficient, but only yields ∆T ad . In a model Mn-22Cu alloy, the maximum ∆T ad (∆T max ad ) under a compressive stress of 100 MPa is calculated as 9.5 and 8.5 K in single crystal (3.5 and 3.8 K in polycrystal) from the indirect and direct method, respectively. It is found that the discrepancy of ∆T max ad by indirect and direct method is within 10% at stress less than 150 MPa, confirming the feasibility of both methods in evaluating eCE at low stress. However, at higher stress, ∆T max ad obtained from the indirect method is notably larger than that from the direct one. This is mainly attributed to that in the non-isothermal PFM simulations, the relatively large temperature increase at high stress could in turn hamper the austenite-martensite transition and thus finally yield a lower ∆T ad . The results demonstrate the developed PFM herein, combined with both indirect and direct method for eCE calculations, as a practicable toolkit for the computational design of elastocaloric devices.

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Section: Indirect Vs Direct Methodsmentioning

confidence: 88%

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Tang¹,

Yang²,

Xu³

et al. 2023

Preprint

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show abstract

“…As an effective approach, stress/strain engineering has been generally employed to regulate the microstructures [27,28] and properties of ferroelectric materials, such as ferroelectricity, [29][30][31][32] piezoelectricity, [33][34][35][36] energy-storage performance, [37][38][39] and ECE. [16,[40][41][42][43][44] Considering the practical application, the cooling temperature range of the ECE is mainly expected to be around room temperature. However, most ferroelectric materials have a relatively high phase transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Designed Giant Room‐Temperature Electrocaloric Effects in Metal‐Free Organic Perovskite [MDABCO](NH₄)I₃ by Phase–Field Simulations

Gao

Shi

Wang

et al. 2021

Adv Funct Materials

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Achieving a colossal room-temperature electrocaloric effect is essential for practical solid-state refrigeration applications with low-cost and highefficiency. Here, through the design of applying external stimuli (hydrostatic pressure and misfit strain), giant room-temperature electrocaloric effects in the bulk and thin film of metal-free organic perovskite [MDABCO](NH 4 )I 3 are obtained by using a combination of thermodynamic calculations and phasefield simulations. Under the hydrostatic pressure of 1 GPa, there emerges excellent room-temperature (300 K) electrocaloric performance with the temperature change (ΔT) of 8.41 K at 30 MV m −1 and electrocaloric strength (ΔT/ΔE) of 0.63 K m MV −1 at 10 MV m −1 , respectively. The prominent electrocaloric effects of MDABCO(NH 4 )I 3 may be related to its rapid change rates of free energy barrier height. Additionally, it can be found that some stripe domains and non-180° domain walls form in the [MDABCO](NH 4 )I 3 bulk, which is consistent with the experimental results. This work not only provides new insights into organic perovskite [MDABCO](NH 4 )I 3 , but also guides for further developing to realize remarkable room-temperature electrocaloric cooling.

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“…Stress has been demonstrated as an effective method inducing the distortion of the unit cell and phase transition of ferroelectric (FE) materials. [ 1–4 ] A key issue is that lattice strain has effects on polarization, which relates to the thermal and electrical properties. For example, the barocaloric effect (BCE) has been reported in (NH 4 ) 2 SO 4 single crystal [ 5 ] and BaTiO 3 (BTO) ceramics, [ 6 ] in which the polarization changes the entropy as well as temperature when external stress is applied.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film

Wang

Zhao

et al. 2021

Physica Status Solidi (a)

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A thermodynamic model is established to investigate the effects of internal stress in PbZrO3 (PZ) antiferroelectric (AFE) film on the barocaloric effect (BCE), electrocaloric effect (ECE), and energy storage properties. It is found that the internal stress can change the phase transition behaviors and free energy barriers among AFE, ferroelectric (FE), and paraelectric (PE) phases. For the BCE, it occurs only in the FE phase induced by stress or temperature. Under a certain temperature, the optimized negative and positive ECE can be obtained by controlling the internal stress and electric field. In addition, the switching electric field of the AFE→FE phase transition increases and causes a larger recoverable energy density with decreasing tensile stress. These results are analyzed and explained by tricritical points (3 cp) with different stresses, temperatures, and electric fields. Therefore, this thermodynamic model provides an effective route to optimize the BCE, ECE, and energy storage properties of PZ films.

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Effects of uniaxial compressive stress on the electrocaloric effect of ferroelectric ceramics

Cited by 7 publications

References 52 publications

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Designed Giant Room‐Temperature Electrocaloric Effects in Metal‐Free Organic Perovskite [MDABCO](NH₄)I₃ by Phase–Field Simulations

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film

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Effects of uniaxial compressive stress on the electrocaloric effect of ferroelectric ceramics

Cited by 7 publications

References 52 publications

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Designed Giant Room‐Temperature Electrocaloric Effects in Metal‐Free Organic Perovskite [MDABCO](NH4)I3 by Phase–Field Simulations

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO3 Antiferroelectric Film

Contact Info

Product

Resources

About

Designed Giant Room‐Temperature Electrocaloric Effects in Metal‐Free Organic Perovskite [MDABCO](NH₄)I₃ by Phase–Field Simulations

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film