A semi-analytical scale bridging approach towards polycrystalline ferroelectrics with mutual nonlinear caloric-electromechanical couplings

Warkentin, Andreas; Ricoeur, Andreas

doi:10.1016/j.ijsolstr.2020.05.016

Cited by 10 publications

(10 citation statements)

References 26 publications

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“…It is known that there are different effects leading to temperature change in ferroelectrics, i.e. dissipative effects and linear reversible effects [1][2][3]. The dissipative effects, observed in our experiments, should be classified as viscoelastic and ferroelectric heating.…”

Section: Introductionmentioning

confidence: 53%

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Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H

Warkentin

Ricoeur

2021

Proc Appl Math and Mech

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This contribution focuses on the separation of two effects causing a temperature change in experiments with electrically loaded ferroelectrics. These materials are often subjected to cyclic loading, where viscoelasticity prevails at lower electric fields, whereas dissipative heating by domain switching governs the heating above the coercive field. Different frequencies and load amplitudes are investigated experimentally.

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Section: Introductionmentioning

confidence: 53%

“…The latter is due to irreversible domain wall motion and has been investigated on the one hand numerically, based on a micropyhsical model, e.g. in [1,2], and on the other hand experimentally, e.g. in [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H

Warkentin

Ricoeur

2021

Proc Appl Math and Mech

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“…In particular, wall motion has often been neglected. This, however, is particularly relevant, because it is known that field-induced switching by DW motion is related to irreversible heat losses [20,25,26].…”

Section: Introductionmentioning

confidence: 99%

Influence of domain walls and defects on the electrocaloric effect

2023

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The electrocaloric (EC) effect is the adiabatic temperature change of a material in a varying external electrical field which is promising for novel cooling devices. While the fundamental understanding of the caloric response of defect-free materials is well progressed, there are important gaps in knowledge on reversibility and time-stability of the response. Particularly, it is not settled how the time-dependent elements of microstructure which are always present in real materials act on the field- induced temperature changes. Ab initio based molecular dynamics simulations allow us to isolate and understand the effects arising from domain walls and defect dipoles and study their interplay. We show that domain walls in cycling fields do not improve the response in either one ferroelectric phase or at the ferroelectric phase transition but may result in irreversible heat losses. The presence of defect dipoles may be beneficial for the EC response for proper field protocols, and interestingly this benefit is not too sensitive to the defect configuration.

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“…This paper adopts the idea of a ferroelectric energy harvesting concept according to [19], numerically investigates a variety of influencing factors on the efficiency, develops prospects for an improvement of the process management and provides an upper bound of figures of merit by non-linear optimization. The condensed method (CM), which is used for the simulations, incorporates multiple aspects of polycrystalline ferroelectrics on different scales [20][21][22], thus allowing a more sophisticated theoretical analysis of the harvesting concept compared to previous work. In section 2.4 a brief overview on some basics of the CM is presented following an introduction to the theoretical framework of ferroelectrics including the microphysical constitutive model.…”

Section: Introductionmentioning

confidence: 99%

Exploiting ferroelectric and ferroelastic effects in piezoelectric energy harvesting: theoretical studies and parameter optimization

Behlen

Warkentin

Ricoeur

2021

Smart Mater. Struct.

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While piezoelectric energy harvesting typically focuses on converting mechanical into electrical energy on the basis of the linear reversible piezoelectric effect, the potential of exploiting the non-linear ferroelectric effect is investigated theoretically in this paper. Due to its dissipative nature, domain switching, on the one hand, is basically avoided in order to prevent mechanical energy from being converted into heat. However, the electrical output, on the other hand, is augmented due to the increased change of electric displacement. In view of these conflicting issues, one main objective in ferroelectric energy harvesting thus is to identify mechanical and electrical process parameters providing appropriate figures of merit. Being an efficient approach to numerically simulate multiphysical polycrystalline material behavior, the so-called condensed method is taken as a basis for the investigation and finally optimization of controllable parameters of ferroelectric energy harvesting cycles. A first idea of a technical implementation taken from literature is considered as cycle of reference, constituting the starting point of the present study, being focused on material aspects rather than on harvesting devices. Different quality assessing parameters are introduced, taking into account general aspects of harvesting efficiency as well as the ratio of irreversible switching-related to reversible piezoelectric contributions. Residual stresses are likewise predicted to give an idea of reliability and the risk of fracture. Two types of cycles and associated optimal process parameters are finally presented.

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A semi-analytical scale bridging approach towards polycrystalline ferroelectrics with mutual nonlinear caloric-electromechanical couplings

Cited by 10 publications

References 26 publications

Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H

Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H

Influence of domain walls and defects on the electrocaloric effect

Exploiting ferroelectric and ferroelastic effects in piezoelectric energy harvesting: theoretical studies and parameter optimization

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