The Experts below are selected from a list of 238476 Experts worldwide ranked by ideXlab platform
Blas P Uberuaga - One of the best experts on this subject based on the ideXlab platform.
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role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Xianming Bai, Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
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the role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
Jamie H Warner - One of the best experts on this subject based on the ideXlab platform.
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Atomic Structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene
Nature Communications, 2020Co-Authors: Sapna Sinha, Taishan Zhu, Arthur Francelanord, Yuewen Sheng, Jeffrey C Grossman, Kyriakos Porfyrakis, Jamie H WarnerAbstract:Lead Iodide (PbI2) is a large bandgap 2D layered material that has potential for semiconductor applications. However, Atomic level study of PbI2 monolayer has been limited due to challenges in obtaining thin crystals. Here, we use liquid exfoliation to produce monolayer PbI2 nanodisks (30-40 nm in diameter and > 99% monolayer purity) and deposit them onto suspended graphene supports to enable Atomic Structure study of PbI2. Strong epitaxial alignment of PbI2 monolayers with the underlying graphene lattice occurs, leading to a phase shift from the 1 T to 1 H Structure to increase the level of commensuration in the two lattice spacings. The fundamental point vacancy and nanopore Structures in PbI2 monolayers are directly imaged, showing rapid vacancy migration and self-healing. These results provide a detailed insight into the Atomic Structure of monolayer PbI2, and the impact of the strong van der Waals interaction with graphene, which has importance for future applications in optoelectronics. Imaging liquid phase exfoliated nanosheets on suspended graphene via annular dark-field STEM can enable identification of various defects, vacancies and their migration. Here, the authors report matching of zigzag edges of monolayer PbI2 with graphene arm-chairs leading to a phase shift from 1 T to 1 H Structure to maximize commensuration of the lattices.
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Atomic Structure and dynamics of metal dopant pairs in graphene
Nano Letters, 2014Co-Authors: Alex W Robertson, Angus I Kirkland, Dongwook Kim, Jisoon Ihm, Euijoon Yoon, Gundo Lee, Jamie H WarnerAbstract:We present an Atomic resolution structural study of covalently bonded dopant pairs in the lattice of monolayer graphene. Two iron (Fe) metal atoms that are covalently bonded within the graphene lattice are observed and their interaction with each other is investigated. The two metal atom dopants can form small paired clusters of varied geometry within graphene vacancy defects. The two Fe atoms are created within a 10 nm diameter predefined location in graphene by manipulating a focused electron beam (80 kV) on the surface of graphene containing an intentionally deposited Fe precursor reservoir. Aberration-corrected transmission electron microscopy at 80 kV has been used to investigate the Atomic Structure and real time dynamics of Fe dimers embedded in graphene vacancies. Four different stable Structures have been observed; two variants of an Fe dimer in a graphene trivacancy, an Fe dimer embedded in two adjacent monovacancies and an Fe dimer trapped by a quadvacancy. According to spin-sensitive DFT calcu...
Louis J Vernon - One of the best experts on this subject based on the ideXlab platform.
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role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Xianming Bai, Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
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the role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
M Nastasi - One of the best experts on this subject based on the ideXlab platform.
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role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Xianming Bai, Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
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the role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
Arthur F Voter - One of the best experts on this subject based on the ideXlab platform.
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role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Xianming Bai, Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.
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the role of Atomic Structure on grain boundary defect interactions in cu
Physical Review B, 2012Co-Authors: Louis J Vernon, R G Hoagland, Arthur F Voter, M Nastasi, Blas P UberuagaAbstract:We investigate the role that the Atomic Structure of grain boundaries in Cu has in the interaction with point defects produced during irradiation. We focus on three aspects of defect-boundary interaction: how defects interact with pristine boundaries, how boundaries modify defect production during collision cascades, and how defects interact with damaged boundaries. We find that there are generic features common to most boundaries, including biased absorption of interstitials over vacancies during collision cascades and strong interactions with vacancies for interstitial-loaded boundaries. However, we find that the magnitude of these behaviors depends strongly on the Atomic Structure of the boundary. In particular, the biased absorption is much stronger for a high angle twist boundary and smallest for a more general twist-asymmetric tilt boundary. Further, the strength of defect-boundary interactions is also sensitive to the boundary Structure. We conclude that the sink strength of grain boundaries for interacting with point defects is not an intrinsic property of the boundary but rather depends on the irradiation condition through the absorbed defect content at the boundary.