1
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Botifoll M, Pinto-Huguet I, Arbiol J. Machine learning in electron microscopy for advanced nanocharacterization: current developments, available tools and future outlook. NANOSCALE HORIZONS 2022; 7:1427-1477. [PMID: 36239693 DOI: 10.1039/d2nh00377e] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In the last few years, electron microscopy has experienced a new methodological paradigm aimed to fix the bottlenecks and overcome the challenges of its analytical workflow. Machine learning and artificial intelligence are answering this call providing powerful resources towards automation, exploration, and development. In this review, we evaluate the state-of-the-art of machine learning applied to electron microscopy (and obliquely, to materials and nano-sciences). We start from the traditional imaging techniques to reach the newest higher-dimensionality ones, also covering the recent advances in spectroscopy and tomography. Additionally, the present review provides a practical guide for microscopists, and in general for material scientists, but not necessarily advanced machine learning practitioners, to straightforwardly apply the offered set of tools to their own research. To conclude, we explore the state-of-the-art of other disciplines with a broader experience in applying artificial intelligence methods to their research (e.g., high-energy physics, astronomy, Earth sciences, and even robotics, videogames, or marketing and finances), in order to narrow down the incoming future of electron microscopy, its challenges and outlook.
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Affiliation(s)
- Marc Botifoll
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain.
| | - Ivan Pinto-Huguet
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain.
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain.
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
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2
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Ding Y, Yang J, Ji Y, Guo Q, Li X, Wang L, Meng Y, Shen X, Yao Y, Yu R. Several factors influencing energy‐loss near‐edge structure calculations using Wien2k. J Microsc 2022; 287:61-68. [DOI: 10.1111/jmi.13111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 05/02/2022] [Accepted: 05/10/2022] [Indexed: 11/27/2022]
Affiliation(s)
- Yifan Ding
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Junkai Yang
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Yu Ji
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Qinwen Guo
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xiangfei Li
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Luyao Wang
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Ying Meng
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xi Shen
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Yuan Yao
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Richeng Yu
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
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3
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Ayoola HO, Li CH, House SD, Bonifacio CS, Kisslinger K, Jinschek J, Saidi WA, Yang JC. Origin and Suppression of Beam Damage-Induced Oxygen-K Edge Artifact from γ-Al2O3 using Cryo-EELS. Ultramicroscopy 2020; 219:113127. [DOI: 10.1016/j.ultramic.2020.113127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 09/06/2020] [Accepted: 09/29/2020] [Indexed: 10/23/2022]
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4
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Chen W, Xie C, Wang Y, Zou Y, Dong CL, Huang YC, Xiao Z, Wei Z, Du S, Chen C, Zhou B, Ma J, Wang S. Activity Origins and Design Principles of Nickel-Based Catalysts for Nucleophile Electrooxidation. Chem 2020. [DOI: 10.1016/j.chempr.2020.07.022] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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5
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Huang W, Zhu Y, Liu Y, Liu L, Yang C, Xu W. Unveiling the atomic defects and electronic structure of Cu 2.2Zn 0.8SnSe 4-xTe x (x = 0 to 0.04) by X-ray absorption fine structure spectroscopy. Phys Chem Chem Phys 2020; 22:9362-9367. [PMID: 32309829 DOI: 10.1039/d0cp01153c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The quaternary chalcogenides consisting of earth-abundant elements such as Cu2ZnSnSe4 (CZTSe) have promising electrical and optical properties prompting enormous technological interest. Understanding different types of defects including Cu/Zn ordering is believed to be the key point to tackle technological challenges such as a large open circuit voltage deficit in CZTSe. The Te doped Cu2.2Zn0.8SnSe4-xTex (x = 0.01-0.04) were investigated using X-ray absorption fine structure spectroscopy at the Cu, Zn, and Se K-edges as well as at the Te L3-edge. Cu at the zinc site with anti-site defects and oxygen interstitials are identified. The detailed electronic structure upon Te doping is studied, providing insights into the rich defect chemistry present in this compound.
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Affiliation(s)
- Weifeng Huang
- School of Electronic Engineering, Jiujiang University, Jiujiang, Jiangxi Province 332005, China
| | - Yingcai Zhu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
| | - Yong Liu
- Foshan (Southern China) Institute for New Materials, Foshan, 528200, Guangdong, P. R. China
| | - Lijuan Liu
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Changchun Yang
- School of Electronic Engineering, Jiujiang University, Jiujiang, Jiangxi Province 332005, China
| | - Wei Xu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China. and Rome International Center for Materials Science, Superstripes, RICMASS, Via deiSabelli 119A, I-00185 Roma, Italy
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6
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Lingerfelt DB, Ganesh P, Jakowski J, Sumpter BG. Understanding Beam-Induced Electronic Excitations in Materials. J Chem Theory Comput 2020; 16:1200-1214. [DOI: 10.1021/acs.jctc.9b00792] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- David B. Lingerfelt
- Nanomaterials Theory Institute, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Panchapakesan Ganesh
- Nanomaterials Theory Institute, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jacek Jakowski
- Nanomaterials Theory Institute, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Nanomaterials Theory Institute, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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7
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Holsgrove KM, Duchamp M, Moreno MS, Bernier N, Naden AB, Guy JGM, Browne N, Gupta A, Gregg JM, Kumar A, Arredondo M. Elastic distortion determining conduction in BiFeO 3 phase boundaries. RSC Adv 2020; 10:27954-27960. [PMID: 35519142 PMCID: PMC9055675 DOI: 10.1039/d0ra04358c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 07/17/2020] [Indexed: 11/23/2022] Open
Abstract
It is now well-established that boundaries separating tetragonal-like (T) and rhombohedral-like (R) phases in BiFeO3 thin films can show enhanced electrical conductivity. However, the origin of this conductivity remains elusive. Here, we study mixed-phase BiFeO3 thin films, where local populations of T and R can be readily altered using stress and electric fields. We observe that phase boundary electrical conductivity in regions which have undergone stress-writing is significantly greater than in the virgin microstructure. We use high-end electron microscopy techniques to identify key differences between the R–T boundaries present in stress-written and as-grown microstructures, to gain a better understanding of the mechanism responsible for electrical conduction. We find that point defects (and associated mixed valence states) are present in both electrically conducting and non-conducting regions; crucially, in both cases, the spatial distribution of defects is relatively homogeneous: there is no evidence of phase boundary defect aggregation. Atomic resolution imaging reveals that the only significant difference between non-conducting and conducting boundaries is the elastic distortion evident – detailed analysis of localised crystallography shows that the strain accommodation across the R–T boundaries is much more extensive in stress-written than in as-grown microstructures; this has a substantial effect on the straightening of local bonds within regions seen to electrically conduct. This work therefore offers distinct evidence that the elastic distortion is more important than point defect accumulation in determining the phase boundary conduction properties in mixed-phase BiFeO3. The localized crystallography of conducting and non-conducting phase boundaries in mixed-phase BiFeO3 is directly compared using scanning transmission electron microscopy techniques.![]()
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Affiliation(s)
| | - Martial Duchamp
- Ernst-Ruska Centre for Microscopy
- Juelich
- Germany
- Nanyang Technological University
- Singapore
| | | | | | - Aaron B. Naden
- School of Mathematics and Physics
- Queen's University Belfast
- UK
- University of St. Andrews
- UK
| | | | - Niall Browne
- School of Mathematics and Physics
- Queen's University Belfast
- UK
| | - Arunava Gupta
- Center for Materials and Information Technology
- University of Alabama
- USA
| | - J. Marty Gregg
- School of Mathematics and Physics
- Queen's University Belfast
- UK
| | - Amit Kumar
- School of Mathematics and Physics
- Queen's University Belfast
- UK
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8
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Milojevic T, Albu M, Blazevic A, Gumerova N, Konrad L, Cyran N. Nanoscale Tungsten-Microbial Interface of the Metal Immobilizing Thermoacidophilic Archaeon Metallosphaera sedula Cultivated With Tungsten Polyoxometalate. Front Microbiol 2019; 10:1267. [PMID: 31275255 PMCID: PMC6593293 DOI: 10.3389/fmicb.2019.01267] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 05/22/2019] [Indexed: 12/15/2022] Open
Abstract
Inorganic systems based upon polyoxometalate (POM) clusters provide an experimental approach to develop artificial life. These artificial symmetric anionic macromolecules with oxidometalate polyhedra as building blocks were shown to be well suited as inorganic frameworks for complex self-assembling and organizing systems with emergent properties. Analogously to mineral cells based on iron sulfides, POMs are considered as inorganic cells in facilitating prelife chemical processes and displaying "life-like" characteristics. However, the relevance of POMs to life-sustaining processes (e.g., microbial respiration) has not yet been addressed, while iron sulfides are very well known as ubiquitous mineral precursors and energy sources for chemolithotrophic metabolism. Metallosphaera sedula is an extreme metallophilic and thermoacidophilic archaeon, which flourishes in hot acid and respires by metal oxidation. In the present study we provide our observations on M. sedula cultivated on tungsten polyoxometalate (W-POM). The decomposition of W-POM macromolecular clusters and the appearance of low molecular weight W species (e.g., WO) in the presence of M. sedula have been detected by electrospray ionization mass spectrometry (ESI-MS) analysis. Here, we document the presence of metalloorganic assemblages at the interface between M. sedula and W-POM resolved down to the nanometer scale using scanning and transmission electron microscopy (SEM and TEM) coupled to electron energy loss spectroscopy (EELS). High-resolution TEM (HR-TEM) and selected-area electron diffraction (SAED) patterns indicated the deposition of redox heterogeneous tungsten species on the S-layer of M. sedula along with the accumulation of intracellular tungsten-bearing nanoparticles, i.e., clusters of tungsten atoms. These results reveal the effectiveness of the analytical spectroscopy coupled to the wet chemistry approach as a tool in the analysis of metal-microbial interactions and microbial cultivation on supramolecular self-assemblages based on inorganic metal clusters. We discuss the possible mechanism of W-POM decomposition by M. sedula in light of unique electrochemical properties of POMs. The findings presented herein highlight unique metallophilicity in hostile environments, extending our knowledge of the relevance of POMs to life-sustaining processes, understanding of the transition of POMs as inorganic prebiotic model to life-sustainable material precursors and revealing biogenic signatures obtained after the decomposition of an artificial inorganic compound, which previously was not associated with any living matter.
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Affiliation(s)
- Tetyana Milojevic
- Extremophiles/Space Biochemistry Group, Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
| | - Mihaela Albu
- Graz Centre for Electron Microscopy, Graz, Austria
| | - Amir Blazevic
- Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
| | - Nadiia Gumerova
- Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
| | - Lukas Konrad
- Graz Centre for Electron Microscopy, Graz, Austria
| | - Norbert Cyran
- Core Facility Cell Imaging and Ultrastructure Research, University of Vienna, Vienna, Austria
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9
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Mathew K, Zheng C, Winston D, Chen C, Dozier A, Rehr JJ, Ong SP, Persson KA. High-throughput computational X-ray absorption spectroscopy. Sci Data 2018; 5:180151. [PMID: 30063226 PMCID: PMC6067047 DOI: 10.1038/sdata.2018.151] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Accepted: 05/18/2018] [Indexed: 11/17/2022] Open
Abstract
X-ray absorption spectroscopy (XAS) is a widely-used materials characterization technique. In this work we present a database of computed XAS spectra, using the Green's formulation of the multiple scattering theory implemented in the FEFF code. With more than 500,000 K-edge X-ray absorption near edge (XANES) spectra for more than 40,000 unique materials, this database constitutes the largest existing collection of computed XAS spectra to date. The data is openly distributed via the Materials Project, enabling researchers across the world to access it for free and use it for comparisons with experiments and further analysis.
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Affiliation(s)
- Kiran Mathew
- Department of Materials Science, University of California Berkeley, Berkeley, CA 94720, USA
| | - Chen Zheng
- Department of Nanoengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Donald Winston
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Chi Chen
- Department of Nanoengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Alan Dozier
- Division of Applied Research and Technology, National Institute for Occupational Safety and Health, Centers for Disease Control, Cincinnati, OH 45226, USA
| | - John J Rehr
- Department of Physics, University of Washington, Seattle, WA 98195, USA
| | - Shyue Ping Ong
- Department of Nanoengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Kristin A Persson
- Department of Materials Science, University of California Berkeley, Berkeley, CA 94720, USA
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10
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Ikeno H, Mizoguchi T. Basics and applications of ELNES calculations. Microscopy (Oxf) 2017; 66:305-327. [PMID: 29016924 DOI: 10.1093/jmicro/dfx033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 08/23/2017] [Indexed: 06/07/2023] Open
Abstract
The electron energy loss near edge structures (ELNES) appearing in an electron energy loss spectrum obtained through transmission electron microscopy (TEM) have the potential to unravel atomic and electronic structures with sub-nano meter resolution. For this reason, TEM-ELNES has become one of the most powerful analytical methods in materials research. On the other hand, theoretical calculations are indispensable in interpreting the ELNES spectrum. Here, the basics and applications of one-particle, two-particle and multi-particle ELNES calculations are reviewed. A key point for the ELNES calculation is the proper introduction of the core-hole effect. Some applications of one-particle ELNES calculations to huge systems of more than 1000 atoms, and complex systems, such as liquids, are reported. In the two-particle calculations, the importance of the correct treatment of the excitonic interaction is demonstrated in calculating the low-energy ELNES, for example at the Li-K edge. In addition, an unusually strong excitonic interactions in the O-K edge of perovskite oxides is identified. The multi-particle calculations are necessary to reproduce the multiplet structures appearing at the transition metal L2,3-edges and rare-earth M4,5-edges. Applications to dilute magnetic semiconductors and Li-ion battery materials are presented. Furthermore, beyond the 'conventional' ELNES calculations, theoretical calculations of electron/X-ray magnetic circular dichroism (MCD) and the vibrational information in ELNES, are reported.
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Affiliation(s)
- Hidekazu Ikeno
- Nanoscience and Nanotechnology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai Osaka 599-8570, Japan
- JST, PRESTO, 4-1-8 Hon-cho, Kawaguchi, Saitama 332-0012, Japan
| | - Teruyasu Mizoguchi
- JST, PRESTO, 4-1-8 Hon-cho, Kawaguchi, Saitama 332-0012, Japan
- Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro, Tokyo 153-8505, Japan
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11
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Dadsetani M, Nouri T, Nejatipour H. Ab initio study of the energy loss near sulfur K and L 2,3 edges of layered MS 2 (M = Ta, Nb and V) in trigonal prismatic and octahedral structures. Micron 2017; 98:1-11. [DOI: 10.1016/j.micron.2017.03.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 03/11/2017] [Accepted: 03/11/2017] [Indexed: 12/29/2022]
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12
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Pankin IA, Kravtsova AN, Polozhentsev OE, Trigub AL, Soldatov MA, Soldatov AV. Analysis of the atomic structure of colloidal quantum dots of the CdSe family: X-ray spectral diagnostics and computer modelling. J STRUCT CHEM+ 2017. [DOI: 10.1134/s0022476616070180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Katsukura H, Miyata T, Tomita K, Mizoguchi T. Effect of the van der Waals interaction on the electron energy-loss near edge structure theoretical calculation. Ultramicroscopy 2016; 178:88-95. [PMID: 27477916 DOI: 10.1016/j.ultramic.2016.07.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 07/07/2016] [Accepted: 07/18/2016] [Indexed: 11/28/2022]
Abstract
The effect of the van der Waals (vdW) interaction on the simulation of the electron energy-loss near edge structure (ELNES) by a first-principles band-structure calculation is reported. The effect of the vdW interaction is considered by the Tkatchenko-Scheffler scheme, and the change of the spectrum profile and the energy shift are discussed. We perform calculations on systems in the solid, liquid and gaseous states. The transition energy shifts to lower energy by approximately 0.1eV in the condensed (solid and liquid) systems by introducing the vdW effect into the calculation, whereas the energy shift in the gaseous models is negligible owing to the long intermolecular distance. We reveal that the vdW interaction exhibits a larger effect on the excited state than the ground state owing to the presence of an excited electron in the unoccupied band. Moreover, the vdW effect is found to depend on the local electron density and the molecular coordination. In addition, this study suggests that the detection of the vdW interactions exhibited within materials is possible by a very stable and high resolution observation.
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Affiliation(s)
- Hirotaka Katsukura
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
| | - Tomohiro Miyata
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
| | - Kota Tomita
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
| | - Teruyasu Mizoguchi
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan.
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14
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Wang Z, Santhanagopalan D, Zhang W, Wang F, Xin HL, He K, Li J, Dudney N, Meng YS. In Situ STEM-EELS Observation of Nanoscale Interfacial Phenomena in All-Solid-State Batteries. NANO LETTERS 2016; 16:3760-3767. [PMID: 27140196 DOI: 10.1021/acs.nanolett.6b01119] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Behaviors of functional interfaces are crucial factors in the performance and safety of energy storage and conversion devices. Indeed, solid electrode-solid electrolyte interfacial impedance is now considered the main limiting factor in all-solid-state batteries rather than low ionic conductivity of the solid electrolyte. Here, we present a new approach to conducting in situ scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) in order to uncover the unique interfacial phenomena related to lithium ion transport and its corresponding charge transfer. Our approach allowed quantitative spectroscopic characterization of a galvanostatically biased electrochemical system under in situ conditions. Using a LiCoO2/LiPON/Si thin film battery, an unexpected structurally disordered interfacial layer between LiCoO2 cathode and LiPON electrolyte was discovered to be inherent to this interface without cycling. During in situ charging, spectroscopic characterization revealed that this interfacial layer evolved to form highly oxidized Co ions species along with lithium oxide and lithium peroxide species. These findings suggest that the mechanism of interfacial impedance at the LiCoO2/LiPON interface is caused by chemical changes rather than space charge effects. Insights gained from this technique will shed light on important challenges of interfaces in all-solid-state energy storage and conversion systems and facilitate improved engineering of devices operated far from equilibrium.
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Affiliation(s)
- Ziying Wang
- Department of NanoEngineering, University of California , San Diego, La Jolla, California 92093, United States
| | - Dhamodaran Santhanagopalan
- Department of NanoEngineering, University of California , San Diego, La Jolla, California 92093, United States
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham University , Kochi, Kerala 682041, India
| | - Wei Zhang
- Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Feng Wang
- Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Huolin L Xin
- Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Kai He
- Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Juchuan Li
- Material Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Nancy Dudney
- Material Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Ying Shirley Meng
- Department of NanoEngineering, University of California , San Diego, La Jolla, California 92093, United States
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15
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Attarian Shandiz M, Guinel MJF, Ahmadi M, Gauvin R. Monte Carlo Simulations of Electron Energy-Loss Spectra with the Addition of Fine Structure from Density Functional Theory Calculations. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:219-229. [PMID: 26914999 DOI: 10.1017/s1431927615015603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A new approach is presented to introduce the fine structure of core-loss excitations into the electron energy-loss spectra of ionization edges by Monte Carlo simulations based on an optical oscillator model. The optical oscillator strength is refined using the calculated electron energy-loss near-edge structure by density functional theory calculations. This approach can predict the effects of multiple scattering and thickness on the fine structure of ionization edges. In addition, effects of the fitting range for background removal and the integration range under the ionization edge on signal-to-noise ratio are investigated.
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Affiliation(s)
| | - Maxime J-F Guinel
- 2Departments of Chemistry and Physics,College of Natural Sciences,University of Puerto Rico,San Juan,PR 00936,USA
| | - Majid Ahmadi
- 3Department of Physics,College of Natural Sciences,University of Puerto Rico,San Juan,PR 00936,USA
| | - Raynald Gauvin
- 1Department of Materials Engineering,McGill University,Montreal,H3A 0C5,Canada
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16
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Moreno MS, Urones-Garrote E, Otero-Díaz LC. Electronic structure of MgS and MgYb2S4: Electron Energy-Loss Spectroscopy and self-consistent multiple scattering calculations. Micron 2015; 73:9-14. [PMID: 25846304 DOI: 10.1016/j.micron.2015.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 03/13/2015] [Accepted: 03/13/2015] [Indexed: 11/24/2022]
Abstract
The electronic structure of MgS and MgYb2S4 have been studied using the fine structure of the Mg-K, S-K, Mg-L2,3, S-L2,3 and Yb-N5 edges measured by electron energy-loss spectroscopy (EELS). Our experimental results are compared with real-space full multiple scattering calculations as incorporated in the FEFF9.6 code. All edges are very well reproduced. Total and partial densities of states have been calculated. The calculated densities of states of Mg and S are similar in both compounds. The energy distribution of these states suggests a covalent nature for both materials. For MgYb2S4 a band gap smaller than for MgS is predicted. In this compound the top of the valence band and the bottom of the conduction band are dominated by Yb states.
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Affiliation(s)
- M S Moreno
- Centro Atómico Bariloche, 8400, San Carlos de Bariloche, Argentina.
| | - Esteban Urones-Garrote
- Centro Nacional de Microscopía Electrónica, Universidad Complutense, Madrid, E-28040, Spain
| | - L C Otero-Díaz
- Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, E-28040, Spain
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17
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Garino C, Borfecchia E, Gobetto R, van Bokhoven JA, Lamberti C. Determination of the electronic and structural configuration of coordination compounds by synchrotron-radiation techniques. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.03.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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18
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Volz D, Wallesch M, Grage SL, Göttlicher J, Steininger R, Batchelor D, Vitova T, Ulrich AS, Heske C, Weinhardt L, Baumann T, Bräse S. Labile or Stable: Can Homoleptic and Heteroleptic PyrPHOS–Copper Complexes Be Processed from Solution? Inorg Chem 2014; 53:7837-47. [DOI: 10.1021/ic500135m] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Daniel Volz
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Manuela Wallesch
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Stephan L. Grage
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Jörg Göttlicher
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Ralph Steininger
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - David Batchelor
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Tonya Vitova
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Anne S. Ulrich
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Clemens Heske
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Lothar Weinhardt
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Thomas Baumann
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Stefan Bräse
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
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19
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Chen PT, Tseng CM, Yung TY, Chu MW, Chen CH, Hayashi M. First-principle calculations analysis of ELNES splitting for Mn3O4 spinels related to atomic local symmetry. Ultramicroscopy 2014; 140:51-6. [DOI: 10.1016/j.ultramic.2014.02.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 01/14/2014] [Accepted: 02/18/2014] [Indexed: 10/25/2022]
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20
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In Situ Time-Resolved XAFS of Transitional States of Pt/C Cathode Electrocatalyst in an MEA During PEFC Loading with Transient Voltages. Top Catal 2014. [DOI: 10.1007/s11244-014-0250-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Curium analysis in plutonium uranium mixed oxide by x-ray fluorescence and absorption fine structure spectroscopy. Talanta 2013; 115:986-91. [DOI: 10.1016/j.talanta.2013.06.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 06/12/2013] [Accepted: 06/14/2013] [Indexed: 11/17/2022]
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22
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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23
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Xu W, Liu L, Cui M, Zheng L, Hu Y, Marcelli A, Wu Z. Electronic structure and hybridization of CaS by means of X-ray absorption spectroscopy at Ca and S K-edges. JOURNAL OF SYNCHROTRON RADIATION 2013; 20:110-115. [PMID: 23254663 DOI: 10.1107/s0909049512040617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Accepted: 09/25/2012] [Indexed: 06/01/2023]
Abstract
The cubic calcium sulfide (CaS) is a well known system and an attractive building block material for many luminescence technological applications. However, it is essential to achieve an accurate understanding of its electronic structure in order to engineer its band structure for optimized applications. Here a study of the electronic structure of CaS by means of X-ray absorption spectroscopy performed at both Ca and S K-edges, and calculations performed in the framework of the multiple-scattering theory and of the finite difference method are presented. At the Ca K-edge the presence of an anomalous d states feature is discussed while in the S K-edge spectrum the presence of a pre-edge shoulder owing to the hybridization among Ca d states and S p states is pointed out. Although the l-projected density of states of CaS is in good agreement with previous first-principles calculations, the standard muffin-tin potential is inadequate to reproduce near-edge structures at both Ca and S K-edges in this system. Indeed, with its highly symmetric and less compact structure, CaS is characterized by a large set of collinear atomic configurations that pose severe constraints on the construction of the atomic potential. On the contrary, the finite-difference method with no muffin-tin approximation is more suitable for X-ray absorption calculations in this system.
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Affiliation(s)
- Wei Xu
- Insitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
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24
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McCulloch D, Lau D, Nicholls R, Perkins J. The near edge structure of cubic boron nitride. Micron 2012; 43:43-8. [DOI: 10.1016/j.micron.2011.07.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 06/16/2011] [Accepted: 07/07/2011] [Indexed: 11/26/2022]
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25
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Kwiatek WM, Czapla J, Podgórczyk M, Kisiel A, Konior J, Balerna A. First approach to studies of sulphur electron DOS in prostate cancer cell lines and tissues studied by XANES. Radiat Phys Chem Oxf Engl 1993 2011. [DOI: 10.1016/j.radphyschem.2011.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Ávila-Brande D, Boese M, Houben L, Schubert J, Luysberg M. Strain-induce shift of the crystal-field splitting of SrTiO₃ embedded in scandate multilayers. ACS APPLIED MATERIALS & INTERFACES 2011; 3:1545-1551. [PMID: 21462998 DOI: 10.1021/am200115j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Strained SrTiO₃ layers have become of interest, since the paraelectric-to-ferroelectric transition temperature can be increased to room temperature. A linear relationship between strain and energy splitting of the fundamental transitions in the fine structure of Ti L(₂,₃) and O K edges is observed, that can be exploited to measure strain from electronic transitions, complementary to measuring local strain directly via high-resolution transmission electron microscopy (HRTEM) images. In particular, for both methods, the geometrical phase analysis performed on high-resolution images and the measurement of the energy splitting by energy loss spectroscopy, tensile strain of SrTiO₃ layers was measured when grown on DyScO₃ and GdScO₃ substrates. The effect of strain on the electron loss near edge structure (ELNES) of the Ti L(₂,₃) edge in comparison to unstrained samples is analyzed. Ab initio calculations of the Ti L(₂,₃) and O K edge show a linear variation of the crystal field splitting with strain. Calculated and experimental values of the crystal field splitting show a very good agreement.
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Affiliation(s)
- D Ávila-Brande
- Ernst Ruska-Centre and Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.
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27
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Extracting physically interpretable data from electron energy-loss spectra. Ultramicroscopy 2010; 110:1390-6. [DOI: 10.1016/j.ultramic.2010.07.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 05/12/2010] [Accepted: 07/08/2010] [Indexed: 11/20/2022]
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28
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Mizoguchi T, Olovsson W, Ikeno H, Tanaka I. Theoretical ELNES using one-particle and multi-particle calculations. Micron 2010; 41:695-709. [PMID: 20576440 DOI: 10.1016/j.micron.2010.05.011] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Revised: 05/21/2010] [Accepted: 05/22/2010] [Indexed: 11/17/2022]
Affiliation(s)
- Teruyasu Mizoguchi
- Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo, Japan.
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29
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Xu W, Marcelli A, Joseph B, Iadecola A, Chu WS, Di Gioacchino D, Bianconi A, Wu ZY, Saini NL. Local structural disorder in REFeAsO oxypnictides by RE L(3) edge XANES. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:125701. [PMID: 21389494 DOI: 10.1088/0953-8984/22/12/125701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The REFeAsO (RE = La, Pr, Nd and Sm) system has been studied by RE L(3) x-ray absorption near edge structure (XANES) spectroscopy to explore the contribution of the REO spacers between the electronically active FeAs slabs in these materials. The XANES spectra have been simulated by full multiple scattering calculations to describe the different experimental features and their evolution with the RE size. The near edge feature just above the L(3) white line is found to be sensitive to the ordering/disordering of oxygen atoms in the REO layers. In addition, shape resonance peaks due to As and O scattering change systematically, indicating local structural changes in the FeAs slabs and the REO spacers due to RE size. The results suggest that interlayer coupling and oxygen order/disorder in the REO spacers may have an important role in the superconductivity and itinerant magnetism of the oxypnictides.
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Affiliation(s)
- W Xu
- BSRF, Institute of High Energy Physics, Chinese Academy of Sciences, 10049, Beijing, People's Republic of China
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30
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Rehr JJ, Kas JJ, Vila FD, Prange MP, Jorissen K. Parameter-free calculations of X-ray spectra with FEFF9. Phys Chem Chem Phys 2010; 12:5503-13. [DOI: 10.1039/b926434e] [Citation(s) in RCA: 810] [Impact Index Per Article: 57.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Tanaka I, Mizoguchi T. First-principles calculations of x-ray absorption near edge structure and energy loss near edge structure: present and future. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:104201. [PMID: 21817421 DOI: 10.1088/0953-8984/21/10/104201] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Computational methods for theoretical x-ray absorption near edge structure (XANES) and energy loss near edge structure (ELNES) are classified into a few groups. Depending on the absorption (or excitation) edge, required accuracy and desired information, one needs to select the most suitable method. In this paper, after providing a map of available computational methods, some examples of first-principles calculations of XANES/ELNES for selected wide gap materials are given together with references. For ZnO, for example, experimental spectra at three edges, Zn K, L(3), and O K, including their orientation dependence, are well reproduced by the supercell calculations with a core hole. Good agreement between theoretical and experimental spectra of ZnO alloys can also be seen. Theoretical fingerprints are satisfactorily obtained in this way. However, there are remaining issues beyond 'good agreements' which need to be solved in the future.
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Affiliation(s)
- Isao Tanaka
- Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta, Nagoya 456-8587, Japan
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32
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Gao SP, Pickard CJ, Perlov A, Milman V. Core-level spectroscopy calculation and the plane wave pseudopotential method. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:104203. [PMID: 21817423 DOI: 10.1088/0953-8984/21/10/104203] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A plane wave based method for the calculation of core-level spectra is presented. We provide details of the implementation of the method in the pseudopotential density functional code CASTEP, including technical issues concerning the calculations, and discuss the applicability and accuracy of the method. A number of examples are provided for comparing the results to both experiment and other density functional theory techniques.
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Affiliation(s)
- Shang-Peng Gao
- Department of Materials Science, Fudan University, Shanghai 200433, People's Republic of China
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33
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Mizoguchi T. Overlap population diagram for ELNES and XANES: peak assignment and interpretation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:104215. [PMID: 21817435 DOI: 10.1088/0953-8984/21/10/104215] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This article reviews overlap population (OP) diagrams for electron energy loss near-edge structure (ELNES) and x-ray absorption near-edge structure (XANES). By using the OP diagrams, peaks in ELNES and XANES of MgO, ZnO, AlN, GaN, InN, and YBa(2)Cu(3)O(7-x) are interpreted in terms of cation-anion and cation-cation interactions. Common features are found in the OP diagrams for different edges. A reconstruction of the unoccupied electronic structure is demonstrated by aligning the different edges with the common features in the OP diagrams. The OP diagram is also applied to the Cu/Al(2)O(3) hetero-interface to find the relationships among ELNES, atomic and electronic structures, and properties.
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Affiliation(s)
- Teruyasu Mizoguchi
- Institute of Engineering Innovation, The University of Tokyo, Yayoi, Bunkyo, Tokyo 113-8656, Japan
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34
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Jackson-Rosario S, Cowart D, Myers A, Tarrien R, Levine RL, Scott RA, Self WT. Auranofin disrupts selenium metabolism in Clostridium difficile by forming a stable Au-Se adduct. J Biol Inorg Chem 2009; 14:507-19. [PMID: 19165513 DOI: 10.1007/s00775-009-0466-z] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2008] [Accepted: 01/02/2009] [Indexed: 12/18/2022]
Abstract
Clostridium difficile is a nosocomial pathogen whose incidence and importance are on the rise. Previous work in our laboratory characterized the central role of selenoenzyme-dependent Stickland reactions in C. difficile metabolism. In this work we have identified, using mass spectrometry, a stable complex formed upon reaction of auranofin (a gold-containing drug) with selenide in vitro. X-ray absorption spectroscopy supports the structure that we proposed on the basis of mass-spectrometric data. Auranofin potently inhibits the growth of C. difficile but does not similarly affect other clostridia that do not utilize selenoproteins to obtain energy. Moreover, auranofin inhibits the incorporation of radioisotope selenium ((75)Se) in selenoproteins in both Escherichia coli, the prokaryotic model for selenoprotein synthesis, and C. difficile without impacting total protein synthesis. Auranofin blocks the uptake of selenium and results in the accumulation of the auranofin-selenide adduct in the culture medium. Addition of selenium in the form of selenite or L-selenocysteine to the growth medium significantly reduces the inhibitory action of auranofin on the growth of C. difficile. On the basis of these results, we propose that formation of this complex and the subsequent deficiency in available selenium for selenoprotein synthesis is the mechanism by which auranofin inhibits C. difficile growth. This study demonstrates that targeting selenium metabolism provides a new avenue for antimicrobial development against C. difficile and other selenium-dependent pathogens.
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Affiliation(s)
- Sarah Jackson-Rosario
- Burnett School of Biomedical Science, College of Medicine, University of Central Florida, Orlando, FL 32816-2364, USA
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35
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Prytz Ø, Sæterli R, Løvvik O, Taftø J. Comparison of the electronic structure of a thermoelectric skutterudite before and after adding rattlers: An electron energy loss study. Micron 2008; 39:685-9. [DOI: 10.1016/j.micron.2007.10.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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