Domain-Wall Enhanced Pyroelectricity

Physical Review X, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 18, 2025

Ferroelectric domain walls are not just static geometric boundaries between polarization domains; they are, in fact, dynamic and functional interfaces with the potential for diverse technological applications. While roles of ferroelectric dielectric piezoelectric responses better understood, their impact on pyroelectric response remains underexplored. Here, (001)-, (101)-, (111)-oriented epitaxial heterostructures tetragonal PbZr0.2Ti0.8O3 is probed. These differently oriented exhibit same type 90° ferroelastic walls, but geometry density vary orientation. In turn, piezoresponse force microscopy direct measurements reveal that both highest coefficients. By varying thickness these (from 100 to 280 nm), can be varied, a correlation domain-wall coefficients found. Molecular-dynamics simulations confirm findings novel contribution volume material or near exhibits significantly higher coefficient as compared bulk domains. Analysis suggests has responsivity external fields temperature. This study sheds light microscopic origin contributions pyroelectricity provides pathway controlling this effect. Published by American Physical Society 2025

Language: Английский

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Coupling of photoluminescence and flexoelectricity in all-inorganic flexible transparent heterojunctions induced by mechanical strain

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(1)

Published: Jan. 2, 2025

Flexible and transparent optoelectronic technology has shown great application prospects in various fields. Introducing rare earth luminescent centers into inorganic ferroelectric systems can benefit the electrical properties by utilizing polar nanodomains brought about doping also facilitate investigation of coupling effect between luminescence modulation flexoelectric effect. This article studies Pr3+-doped barium titanate all-inorganic flexible heterojunctions explores direct fluorescence response through mechanical strain stimulation. We aim to investigate essential correlation physical mechanism strain-flexoelectricity-photoluminescence (force-electric-photon) coupling, providing an important basis for dynamic balance regulation radiative non-radiative transitions. Therefore, this work will significantly promote development highly integrated sensing intelligent devices.

Language: Английский

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Polar Hopf rings emerge in antiferroelectrics

Scripta Materialia, Journal Year: 2025, Volume and Issue: 262, P. 116649 - 116649

Published: March 19, 2025

Language: Английский

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Polarization Rearrangement Induced High-Efficiency Piezocatalytic Overall Pure Water Splitting in Ultrathin (001)-Confined PbTiO₃

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Facing the emergencies of global warming and energy shortages, nano ferroelectrics, which exhibit superior charge separation capabilities polarization tunability, are extensively utilized in piezocatalytic H2 production. However, acquiring polarized structures that behave with robust ferroelectricity strong piezoelectricity ultralow dimension nanomaterials for efficient piezocatalysis remains a huge challenge. This research achieved exceptional overall pure water splitting performance 3.5 nm-thick (001)-confined PbTiO3 nanosheets, reaching evolution rate 1068 μmol g-1 h-1, exceeding those similar ferroelectric oxides. The highly confined crystallographic orientation nanosheets induced rearrangement from c-axis to other nonpolarized orientations, as evidenced by piezoelectric force microscopy phase field simulations, improve boost behavior significantly. Local structure investigations jointly neutron pair distribution function, X-ray absorption spectrum, atomic-scale scanning transmission electron methods show rearranged arises lattice inhomogeneous tensile strain. TiO6 octahedrons were distorted, Ti atom moving diagonally toward symmetry center. Such reconstruction practical nanopolarized remarkable this work will promote development high-performance ferroelectrics.

Language: Английский

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Recent Advancement in Ferroic Freestanding Oxide Nanomembranes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Ferroic and multiferroic oxides have been of significant interest for the last four decades due to their tremendous potential next-generation memory computational technologies. Possessing multiple ferroic orders with strong coupling between them erects a new way toward fast low voltage switching. The major challenge is scarcity materials at room temperature operation high strength robust orderings. Integration existing multiferroics, mostly complex oxides, into silicon-based platform also poses challenge. recent development freestanding oxide membranes offers versatile solution novel strategies develop materials. In this mini-review, we summarize developments that happened in very years nanomembranes. We outline different approaches implemented modulate orderings, magnetism, ferroelectricity, ferroelasticity. Along well-developed methods, such as bending stretching membranes, emphasize twisting promising design tune

Language: Английский

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Polar topological materials and devices: Prospects and challenges

Progress in Materials Science, Journal Year: 2025, Volume and Issue: unknown, P. 101489 - 101489

Published: April 1, 2025

Language: Английский

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Giant Shear-vertical Wave Bandgaps Induced by Diffuse Domain-walls in Ferroelectrics

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: 294, P. 110239 - 110239

Published: April 16, 2025

Language: Английский

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Finite‐temperature properties of NbO2 ${\text{NbO}}_{2}$ from a deep‐learning interatomic potential

Materials Genome Engineering Advances, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Using first‐principles‐based machine‐learning potential, molecular dynamics (MD) simulations are performed to investigate the micro‐mechanism in phase transition of . Treating DFT results low‐ and intermediate‐temperature phases as training data deep‐learning model, we successfully constructed an interatomic potential capable accurately reproducing transitions from low‐temperature (pressure) high‐temperature regimes. Notably, our predict a high‐pressure monoclinic (>14 GPa) without treating its information set, consistent with previous experimental findings, demonstrating reliability potential. We identified Nb‐dimers key structural motif governing transitions. At low temperatures, displacements drive between (‐) phases, while at high Nb ions prone being equally distributed disappearance leads stabilization high‐symmetry phase. These findings elucidate dynamical mechanisms underlying properties highlight utility combining deep MD methods for studying complex metal oxides.

Language: Английский

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Enhanced Bulk Photovoltaic Effect of Single‐Domain Freestanding BiFeO₃ Membranes

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 26, 2024

Abstract The bulk photovoltaic effect (BPVE), which uniquely exists in non‐centrosymmetric materials, has been received extensive attention recently due to its potential overcome the theoretical Shockley‐Queisser limit traditional p–n junction solar cells. Here, freestanding single‐domain BiFeO 3 membranes are exfoliated from miscut SrTiO substrates by dissolving Sr Al 2 O 6 sacrificial layers, and transferred on SiO /Si substrates. This study finds that maintain structure exhibits significantly enhanced response (≈200% enhancement), compared strained films. comprehensive atomic imaging analyses manifest membrane demonstrates bigger noncentral ion (Fe) displacement, results larger in‐plane ferroelectric polarization substantial increase BPVE photocurrent. work not only provides an effective approach enhance of oxide films, but also can potentially promote exploration integrated with silicon‐based or 2D electronics.

Language: Английский

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A brief review on strain engineering of ferroelectric KxNa1−xNbO3 epitaxial thin films: Insights from phase-field simulations

Journal of materials research/Pratt's guide to venture capital sources, Journal Year: 2024, Volume and Issue: 39(21), P. 2918 - 2933

Published: Oct. 24, 2024

Language: Английский

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