Needle‐Like Ferroelastic Domains in Individual Ferroelectric Nanoparticles

Liu, Zhen; Schold, Elijah; Karpov, Dmitry; Harder, Ross; Lookman, Turab; Fohtung, Edwin

doi:10.1002/aelm.201901300

Cited by 11 publications

(7 citation statements)

References 57 publications

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“…BCDI has been applied in several fields of science and technology including the study of NPs in general, ,,,,,− zeolites, , heterogeneous catalysis, ,,− batteries, − supercapacitors dielectrics, − nanowires, ,− minerals, − alloys and dealloying, − nanorods, ,− proteins, − thin films, ,…”

Section: Bcdi Applied To Electrochemistry and Heterogeneous Catalysismentioning

confidence: 99%

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

et al. 2021

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Electrocatalysis is at the heart of a broad range of physicochemical applications that play an important role in the present and future of a sustainable economy. Among the myriad of different electrocatalysts used in this field, nanomaterials are of ubiquitous importance. An increased surface area/volume ratio compared to bulk makes nanoscale catalysts the preferred choice to perform electrocatalytic reactions. Bragg coherent diffraction imaging (BCDI) was introduced in 2006 and since has been applied to obtain 3D images of crystalline nanomaterials. BCDI provides information about the displacement field, which is directly related to strain. Lattice strain in the catalysts impacts their electronic configuration and, consequently, their binding energy with reaction intermediates. Even though there have been significant improvements since its birth, the fact that the experiments can only be performed at synchrotron facilities and its relatively low resolution to date (∼10 nm spatial resolution) have prevented the popularization of this technique. Herein, we will briefly describe the fundamentals of the technique, including the electrocatalysis relevant information that we can extract from it. Subsequently, we review some of the computational experiments that complement the BCDI data for enhanced information extraction and improved understanding of the underlying nanoscale electrocatalytic processes. We next highlight success stories of BCDI applied to different electrochemical systems and in heterogeneous catalysis to show how the technique can contribute to future studies in electrocatalysis. Finally, we outline current challenges in spatiotemporal resolution limits of BCDI and provide our perspectives on recent developments in synchrotron facilities as well as the role of machine learning and artificial intelligence in addressing them.

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Section: Bcdi Applied To Electrochemistry and Heterogeneous Catalysismentioning

confidence: 99%

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

et al. 2021

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“…Experiments, ,− as well as many simulations, − have beautifully established the presence of multiple phases and polarization rotations in BTO-based compositions at the nanoscale. Our previous Bragg coherent diffractive imaging (BCDI) work, coupled with phase field simulations, has also identified the monoclinic phase and shown how the phase fractions change as the vortex is driven under the influence of an external field .…”

Section: Introductionmentioning

confidence: 96%

Enhanced Piezoelectric Response at Nanoscale Vortex Structures in Ferroelectrics

Shi,

Nazirkar,

Kashikar

et al. 2024

ACS Appl. Mater. Interfaces

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The piezoelectric response is a measure of the sensitivity of a material's polarization to stress or its strain to an applied field. Using in operando X-ray Bragg coherent diffraction imaging, we observe that topological vortices are the source of a 5-fold enhancement of the piezoelectric response near the vortex core. The vortices form where several low-symmetry ferroelectric phases and phase boundaries coalesce. Unlike bulk ferroelectric solid solutions in which a large piezoelectric response is associated with coexisting phases in the proximity of the triple point, the largest responses for pure BaTiO 3 at the nanoscale are in spatial regions of extremely small spontaneous polarization at vortex cores. The response decays inversely with polarization away from the vortex, analogous to the behavior in bulk ceramics as the cation compositions are varied away from the triple point. We use first-principlesbased molecular dynamics to augment our observations, and our results suggest that nanoscale piezoelectric materials with a large piezoelectric response can be designed within a parameter space governed by vortex cores. Our findings have implications for the development of next-generation nanoscale piezoelectric materials.

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“…BCDI techniques are emerging at third and fourth-generation light sources [23] as a state of the art non-destructive tool for 3D imaging of strain inhomogeneity [24][25][26][27][28][29] and dynamics [30,31] within and in the vicinity of a nanocrystal. Recent advances in instrumentation [32,33] and phasing algorithms [34][35][36][37] used in BCDI have seen a wide range of application in imaging ferroelectric polarization [38], ferroelastic domains [39], magnetostrictive strain [40], defects [41,42] and other functional material properties [43][44][45][46][47][48] in individual nanostructures. For a review of Bragg coherent diffractive imaging of strain and a general overview of coherent diffractive imaging please see Refs.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Mapping of Heterogeneous Strain and Defects in Individual Magnetic Nanocrystals

et al. 2020

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We map the three-dimensional strain heterogeneity within a single core-shell Ni nanoparticle using Bragg coherent diffractive imaging. We report the direct observation of both uniform displacements and strain within the crystalline core Ni region. We identify non-uniform displacements and dislocation morphologies across the core–shell interface, and within the outer shell at the nanoscale. By tracking individual dislocation lines in the outer shell region, and comparing the relative orientation between the Burgers vector and dislocation lines, we identify full and partial dislocations. The full dislocations are consistent with elasticity theory in the vicinity of a dislocation while the partial dislocations deviate from this theory. We utilize atomistic computations and Landau–Lifshitz–Gilbert simulation and density functional theory to confirm the equilibrium shape of the particle and the nature of the (111) displacement field obtained from Bragg coherent diffraction imaging (BCDI) experiments. This displacement field distribution within the core-region of the Ni nanoparticle provides a uniform distribution of magnetization in the core region. We observe that the absence of dislocations within the core-regions correlates with a uniform distribution of magnetization projections. Our findings suggest that the imaging of defects using BCDI could be of significant importance for giant magnetoresistance devices, like hard disk-drive read heads, where the presence of dislocations can affect magnetic domain wall pinning and coercivity.

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Needle‐Like Ferroelastic Domains in Individual Ferroelectric Nanoparticles

Cited by 11 publications

References 57 publications

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

Enhanced Piezoelectric Response at Nanoscale Vortex Structures in Ferroelectrics

Nanoscale Mapping of Heterogeneous Strain and Defects in Individual Magnetic Nanocrystals

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