The emergence of tunable negative electrocaloric effect in ferroelectric/paraelectric superlattices

Ji, Ye; Chen, W. J.; Zheng, Yue

doi:10.1088/1361-6463/abb271

Cited by 17 publications

(14 citation statements)

References 55 publications

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“…(E) Domain structures in PST45/5 film at temperatures of 70°C (E1) and 120°C (E2) 68 . (F) The vortex‐to‐polar transition in the Pb 1‐ x Sr x TiO 3 (PST)/SrTiO 3 (STO) ferroelectric/paraelectric superlattice 69 …”

Section: Intrinsic Influence Factors Of Materialsmentioning

confidence: 99%

“…In the past few decades, not only experimentally, many researches on ECEs of multilayer composites have been performed theoretically. For example, the bilayer films, 47,49,67 compositional gradient materials, 50,68 and ferroelectric superlattice 51–53,69 . The composition, layer thickness, strain, domain, orientation, and electric field all significantly influence the ECE of multilayer materials.…”

Section: Intrinsic Influence Factors Of Materialsmentioning

confidence: 99%

“…For example, the bilayer films, 47,49,67 compositional gradient materials, 50,68 and ferroelectric superlattice. [51][52][53]69 The composition, layer thickness, strain, domain, orientation, and electric field all significantly influence the ECE of multilayer materials. Qiu et al investigated the ECEs of BaTiO 3 /SrTiO 3 (BTO/STO), 47 PTO/STO, 48 P(VDF-TrFE)/STO 49 multilayer film via the phenomenological thermodynamic model.…”

Section: Multilayer Compositesmentioning

confidence: 99%

“…80 (E) Domain structures in PST45/5 film at temperatures of 70 • C (E1) and 120 • C (E2). 68 (F) The vortex-to-polar transition in the Pb 1-x Sr x TiO 3 (PST)/SrTiO 3 (STO) ferroelectric/paraelectric superlattice 69 domain transitions (double vortex domain to single vortex domain, single domain to single vortex domain transition). Furthermore, through phase-field simulations, as shown in Figure 5E, the needle-to-vortex domain transition was found in PST films with large composition gradients as the temperature increases, which is different from the periodic fringe domain structure in corresponding composition homogeneous film.…”

Section: Vortex Domainmentioning

confidence: 99%

“…68 The local concentration of the total energy near the root of the needle domain drives the transition from the needle to the vortex domain, thereby enhancing the ECE in the film. Ji et al 69 found that, in the PST/STO ferroelectric/paraelectric superlattice with suitable thickness, the screening effect determined by the thickness of the STO layer can stabilize various vortex states. The unique response of these vortex domains to temperature and external electric fields produces tunable positive and negative ECEs.…”

Section: Vortex Domainmentioning

confidence: 99%

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Understanding electrocaloric cooling of ferroelectrics guided by phase‐field modeling

et al. 2022

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With the urgent need to explore low-cost, high-efficiency solid-state refrigeration technology, the electrocaloric effects of ferroelectric materials have attracted much attention in the past decades. With the development of modern computing technology, the phase-field method is widely used to simulate the evolution of microstructure at mesoscale and predict the properties of different types of ferroelectric materials. In this article, we review the recent progress of electrocaloric effects from phenomenological Landau thermodynamics theory to phase-field simulation by discussing the microcosmic composition, mesoscopic domain structures, macroscopic size/shape, and external stimulus of strain/stress. More importantly, in searching for new ferroelectric electrocaloric cooling materials, it is possible to find materials whose free energy barrier height changes rapidly with temperature, such materials have a faster change rate with polarization temperature in terms of ferroelectric macroscopic properties, from them could get superior electrocaloric effects. We compile a relatively comprehensive computational design on the high performance of electrocaloric effects in different types of ferroelectrics and offer a perspective on the computational design of electrocaloric refrigeration materials at the mesoscale microstructure level.

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Section: Intrinsic Influence Factors Of Materialsmentioning

confidence: 99%

Section: Intrinsic Influence Factors Of Materialsmentioning

confidence: 99%

Section: Multilayer Compositesmentioning

confidence: 99%

Section: Vortex Domainmentioning

confidence: 99%

Section: Vortex Domainmentioning

confidence: 99%

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Understanding electrocaloric cooling of ferroelectrics guided by phase‐field modeling

et al. 2022

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Enhanced Electrocaloric Response in Electrostatically Frustrated Ferroelectrics

Murillo-Navarro

Aramberri

Íñiguez

2023

Physica Rapid Research Ltrs

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The electrocaloric effect (i.e., the temperature change of a material upon the adiabatic application of an electric field) can be large in ferroelectric compounds, to the extent of offering an eco‐friendly alternative to current, polluting and noisy, refrigeration technologies. So far, ferroelectric‐based electrocaloric devices employ materials (from perovskite oxides to polymers) that have been known for decades. At the same time, recent studies have shown that the functional response of a ferroelectric can be drastically enhanced by controlling its mechanical and electric boundary conditions. Here, we use atomistic second‐principles simulations to quantify how much the electrocaloric effect benefits from such an enhancement. Using ferroelectric/dielectric superlattices as representative model systems, we predict that temperature changes can indeed be increased significantly (more than two times at room temperature), suggesting electrostatic engineering—to induce very reactive frustrated ferroelectric states—as a promising route for electrocaloric optimization.

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Theoretical Understanding of Polar Topological Phase Transitions in Functional Oxide Heterostructures: A Review

et al. 2022

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The exotic topological phase is attracting considerable attention in condensed matter physics and materials science over the past few decades due to intriguing physical insights. As a combination of “topology” and “ferroelectricity,” the ferroelectric (polar) topological structures are a fertile playground for emergent phenomena and functionalities with various potential applications. Herein, the review starts with the universal concept of the polar topological phase and goes on to briefly discuss the important role of computational tools such as phase‐field simulations in designing polar topological phases in oxide heterostructures. In particular, the history of the development of phase‐field simulations for ferroelectric oxide heterostructures is highlighted. Then, the current research progress of polar topological phases and their emergent phenomena in ferroelectric functional oxide heterostructures is reviewed from a theoretical perspective, including the topological polar structures, the establishment of phase diagrams, their switching kinetics and interconnections, phonon dynamics, and various macroscopic properties. Finally, this review offers a perspective on the future directions for the discovery of novel topological phases in other ferroelectric systems and device design for next‐generation electronic device applications.

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The emergence of tunable negative electrocaloric effect in ferroelectric/paraelectric superlattices

Cited by 17 publications

References 55 publications

Understanding electrocaloric cooling of ferroelectrics guided by phase‐field modeling

Understanding electrocaloric cooling of ferroelectrics guided by phase‐field modeling

Enhanced Electrocaloric Response in Electrostatically Frustrated Ferroelectrics

Theoretical Understanding of Polar Topological Phase Transitions in Functional Oxide Heterostructures: A Review

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