Article
Chemistry, Physical
Yu Xia, Jiaming Liu, Xingchu Zhang, Renlong Zhou
Summary: Research findings show that laser energy absorption and field evaporation mechanisms can be described by an effective cross section, while the fluctuation of charge state is influenced by collective excitation of electrons. The average charge state is only dependent on the static field strength.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
A. J. Breen, F. Theska, B. Lim, S. Primig, S. P. Ringer
Summary: A new experimental method is proposed to quantify the site-occupancy of substitutional solute elements in multi-component intermetallics. The method was applied to study the site-occupancy of the L12 ordered gamma' phase in different regions of an IN-738LC build. The results showed variations in site-occupancy ratios for different elements at different sites.
Article
Chemistry, Physical
Daniel S. Mosiman, Yi-Sheng Chen, Limei Yang, Brian Hawkett, Simon P. Ringer, Benito J. Marinas, Julie M. Cairney
Summary: Two techniques were developed to encapsulate and prepare HAP NPs into APT tips for characterization, revealing significant tradeoffs between encapsulant methods/materials for HAP characterization and the need for further technique development to select a more robust approach. This work serves as an essential starting point for advancing knowledge about the nanoscale spatiochemistry of HAP NPs.
Article
Nanoscience & Nanotechnology
T. T. Sasaki, J. Y. Lin, P. Yi, Z. H. Li, S. E. Prameela, A. Park, E. Lipkin, A. Lee, M. L. Falk, T. P. Weihs, K. Hono
Summary: In this study, the deformation-induced precipitation of G.P. zones in Mg-9Al and Mg-5 Zn alloys during equal channel angular extrusion has been reported. Atom probe tomography and hybrid molecular dynamics/Monte Carlo simulations suggest that strategic control of atomic-scale defects can generate novel microstructures, thereby strengthening the deformed Mg alloys.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Sudip Kumar Sarkar, Aniruddha Biswas
Summary: This study quantifies the nano-scale micro-hardness and microstructural evolution of a high-Cr binary ferritic Fe-20 at.% Cr alloy during thermal aging using a combination of atom probe tomography, transmission electron microscopy, and small angle neutron scattering. It successfully estimates the mechanical response of the alloy through reliable quantification and suitable hardening models.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Martin Detrois, Zongrui Pei, Tao Liu, Jonathan D. Poplawsky, Michael C. Gao, Paul D. Jablonski, Jeffrey A. Hawk
Summary: The study found that silicon has a negative impact on the improvement of creep properties in Ni-based superalloys when using B, as silicon decreases the grain boundary cohesion, offsetting the effects of B segregation.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Tim M. Schwarz, Hongyi Zhan, Baptist Gault, Christopher M. Gourlay, Ingrid McCarroll
Summary: The peak-aged magnesium-aluminum-rare earth (Mg-Al-RE) alloy AE44-2, produced through high-pressure die casting, exhibits a 10% increase in yield strength due to the formation of nanoscale AlMn precipitates. Atom probe tomography reveals the presence of Ce-rich clusters in the dendritic region rather than the inter-dendritic alpha-Mg in the as cast state, indicating their formation is mainly determined by solidification kinetics rather than concentration. These Ce-rich clusters act as heterogeneous nucleation sites for the formation of Al10Mn7RE2 nanoscale precipitates during the T5 heat treatment, suggesting a potential pathway for tailoring mechanical properties.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Colin A. Stewart, Richard W. Fonda, Keith E. Knipling
Summary: An ICME approach was utilized to design a fully Austenitic, Mn-stabilized steel strengthened by nano-scale precipitate phases. Experimental verification confirmed that significant strengthening can be achieved by adding Cu together with Ni+Al, forming FCC-Cu and beta-NiAl nano-precipitates.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
P. Maugis, M. Jouiad, F. Roch, C. Perrin-Pellegrino, K. Hoummada
Summary: Experimental and modeling studies on carbon and nitrogen segregation to dislocations in C-Mn ferritic steels were reported. A model based on McLean theory was established to describe the competitive segregation of carbon and nitrogen in the Cottrell atmospheres around dislocations, taking into account the effect of dislocation density. It was found that the plastic strain during tensile test can modify the material properties by changing the nature and quantity of segregated atoms around dislocations, leading to a preferential segregation of nitrogen over carbon.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Geochemistry & Geophysics
Rick Verberne, Steven M. Reddy, David W. Saxey, Denis Fougerouse, William D. A. Rickard, Zakaria Quadir, Noreen J. Evans, Chris Clark
Summary: Element mobility is crucial in geological processes, and understanding how elements migrate in minerals is essential for geochemical and geochronological applications. This study investigates the trace-element composition of dislocations on twin boundaries in rutile using atom probe tomography and transmission electron microscopy. The findings reveal that dislocations in rutile can act as both fast-diffusion pathways and traps for trace elements.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Physics, Applied
Constantinos Hatzoglou, Benjamin Klaes, Fabien Delaroche, Gerald Da Costa, Brian Geiser, Markus Kuehbach, Peter B. Wells, Francois Vurpillot
Summary: Reconstructions in atom probe tomography are biased by image distortions arising from dynamic changes of the specimen geometry. Current models for understanding and reproducing image artifacts are too slow or not adapted to be routinely used in image correction approaches. To address this, we propose an alternative simulation tool based on a coarse-grained model of the sample surface that accurately reproduces the effects of temperature and electric field on ion projection.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Arjun BalaKrishnan, Niclas Blanc, Ulrich Hagemann, Parham Gemagami, Kevin Wonner, Kristina Tschulik, Tong Li
Summary: The effect of different surface orientations on the formation of iridium oxide species during the oxygen evolution reaction (OER) was studied using a needle-shaped iridium atom probe specimen as a nanosized working electrode. It was found that a thick subsurface oxide layer consisting of sub-stoichiometric Ir-O species on the open (024) planes contributes additional activity to the OER process. This study highlights the importance of surface morphological effects on iridium electrocatalysts for OER and provides a new method to directly reveal surface species on electrocatalysts at the atomic scale.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Christian Bacchi, Gerald Da Costa, Emmanuel Cadel, Fabien Cuvilly, Jonathan Houard, Charly Vaudolon, Antoine Normand, Francois Vurpillot
Summary: A new position and energy-sensitive detector has been developed to address mass peak overlap issues in atom probe tomography experiments. This detector is based on a thin carbon foil positioned on the front panel of a conventional MCP-DLD detector, and has demonstrated the ability to improve quantitative and qualitative analysis for critical materials with mass peak overlaps.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Chemistry, Physical
Chanwon Jung, Biswanath Dutta, Poulumi Dey, Seong-jae Jeon, Seungwoo Han, Hyun-Mo Lee, Jin-Seong Park, Seong-Hoon Yi, Pyuck-Pa Choi
Summary: A novel method of fabricating nanostructured Heusler compounds is proposed by crystallizing an amorphous precursor, resulting in two distinct nanostructures. One of the structures exhibits enhanced negative Seebeck coefficients, potentially due to low energy electron filtering and Co interstitial defects at the interfaces within the nano precipitates. Advanced characterization techniques and theoretical calculations provide detailed insights into the samples.
Article
Microscopy
P. Dumas, S. Duguay, J. Borrel, F. Hilario, D. Blavette
Summary: Atom Probe Tomography (APT) was used to quantify carbon in implanted silicon under different electric field conditions, with more accurate results obtained in the lower electric field analysis. The number of self-interstitials trapped per carbon atom in clusters was also discussed and found to be of interest for the microelectronics industry.
Article
Materials Science, Multidisciplinary
K. N. Sasidhar, Heena Khanchandani, Siyuan Zhang, Alisson Kwiatkowski da Silva, C. Scheu, Baptiste Gault, Dirk Ponge, Dierk Raabe
Summary: We conducted high-resolution structural and chemical characterization of the oxide films on a ferritic Fe-13 at% Cr alloy at different growth stages. The protective oxide film was found to be 5-6 nm thick, epitaxially grown with a cubic spinel-structure, and had a Baker-Nutting orientation-relationship with the alloy. The composition evolution within the oxide was explained by the low solid-state mobility of Cr3+ cations, suggesting the miscibility gap in the Fe-Cr spinel oxide solid-solution as a cause for the reduced driving force for oxide-layer thickening over time.
Article
Nanoscience & Nanotechnology
Siyang Wang, James O. Douglas, Edmund Lovell, Neil Wilson, Liya Guo, Baptiste Gault, Mary P. Ryan, Finn Giuliani
Summary: La(Fe,Mn,Si)13-based magnetocaloric materials are promising for near-room temperature magnetic refrigeration. Their functional and mechanical properties depend on their chemistry, which is difficult to control at microstructural interfaces. Atom probe tomography revealed strong Mn segregation and off-1:13 stoichiometry at the phase and grain boundaries, respectively. Strategies to mitigate these negative effects are discussed to achieve durable and efficient operation of magnetic cooling devices.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Ruben Bueno Villoro, Maxwell Wood, Ting Luo, Hanna Bishara, Lamya Abdellaoui, Duncan Zavanelli, Baptiste Gault, Gerald Jeffrey Snyder, Christina Scheu, Siyuan Zhang
Summary: Complex microstructures in thermoelectric materials can be utilized to optimize their transport properties. In TiCoSb half Heusler compounds, Fe-dopants segregate to grain boundaries, increasing the electrical conductivity and reducing the thermal conductivity. The electrical conductivity of the grain interior and boundaries is calculated, and the atomic structure of grain boundaries is studied. Segregation engineering in fine-grained thermoelectrics is proposed as a new design tool to optimize transport properties while achieving a lower thermal conductivity.
Article
Materials Science, Multidisciplinary
T. S. Prithiv, Baptiste Gault, Yujiao Li, Dustin Andersen, Nathalie Valle, Santhana Eswara, Dirk Ponge, Dierk Raabe
Summary: The addition of boron (B) to steels significantly suppresses the austenite to ferrite phase transformation, increasing their hardenability. The mechanisms of B segregation and how exactly B suppresses the ferrite nucleation remain elusive.
Article
Materials Science, Multidisciplinary
Baptiste Gault, Heena Khanchandani, Thoudden Sukumar Prithiv, Stoichko Antonov, T. Ben Britton
Summary: Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is aided by transmission Kikuchi diffraction (TKD), but the potential structural damage caused by TKD is often ignored. Two case studies demonstrate damage in APT specimens from TKD mapping. The damage includes planar segregation of solutes and the formation of voids containing high concentrations of a specific element.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
James O. Douglas, Michele Conroy, Finn Giuliani, Baptiste Gault
Summary: Workflows have been developed in the past decade to enable atom probe tomography analysis at cryogenic temperatures. The inability to control the local deposition of the metallic precursor from the gas-injection system (GIS) at cryogenic temperatures makes the preparation of site-specific specimens by using lift-out extremely challenging in the focused-ion beam. Schreiber et al. exploited redeposition to weld the lifted-out sample to a support.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Felipe F. Morgado, Leigh Stephenson, Loic Rousseau, Francois Vurpillot, Simon Evertz, Jochen M. Schneider, Baptiste Gault
Summary: In this study, a chemically resolved atomic resolution imaging technique is developed by combining the atomic spatial resolution of field ion microscopy with the time-of-flight spectrometry of atom probe tomography. By implementing specialized flight path corrections and filtering algorithms, the performance of the technique is improved, leading to a significant increase in signal-to-background ratio. This technique not only enables the differentiation and identification of isotopes in pure tungsten, but also allows for elemental identification in non-metallic materials and binary alloys.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Se-Ho Kim, Leigh T. Stephenson, Torsten Schwarz, Baptiste Gault
Summary: This study compared the distribution of constituent elements in two different smartphone glass samples using X-ray spectroscopy techniques and atom probe tomography (APT). The results demonstrated that APT can be considered as an alternative technique for imaging the chemical distribution in glass for mobile applications.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Multidisciplinary Sciences
Xuyang Zhou, Ali Ahmadian, Baptiste Gault, Colin Ophus, Christian H. Liebscher, Gerhard Dehm, Dierk Raabe
Summary: Grain boundaries, the defects between differently oriented crystals, play an important role in solute segregation and material properties. The interplay of structure and composition of grain boundaries at the atomic level remains unclear. Through charge-density imaging and atom probe tomography, the authors reveal that the atomic motifs control the chemical properties of grain boundaries and enable the targeted design and passivation for various applications.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Loic Rousseau, Antoine Normand, Felipe F. Morgado, Hanne-Sofie Marie Scisly Soreide, Leigh T. Stephenson, Constantinos Hatzoglou, Gerald Da Costa, Kambiz Tehrani, Christoph Freysoldt, Baptiste Gault, Francois Vurpillot
Summary: We demonstrate that information on the chemical and bonding states of atoms in a material can be accessed using straight-flight-path atom probe tomography experimental data, but it requires additional processing. We develop a data processing approach called evaporation energy loss spectroscopy (FEELS), which involves an activation energy model and DFT simulations, to quantify the ion energy loss associated with the field evaporation process and reconstruct the original bond framework of the atoms on the surface. We apply FEELS to analyze microstructural features and defects in a range of metallic materials and discuss its general applicability to atom probe data sets.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
L. Becker, J. Boes, J. Lentz, C. Cui, M. Steinbacher, Y. Li, R. Fechte-Heinen, W. Theisen, S. Weber
Summary: The present study focuses on the heat treatment of additively manufactured duplex stainless steels (DSS) using the PBF-LB/M process. It aims to explain the influence of the as-built microstructure on phase formation during solution annealing and the effect of different annealing times on mechanical and corrosive properties.
Article
Chemistry, Multidisciplinary
Mathias Kraemer, Bar Favelukis, Ayman A. El-Zoka, Maxim Sokol, Brian A. Rosen, Noam Eliaz, Se-Ho Kim, Baptiste Gault
Summary: A study reveals the presence of alkali and halogen elements, as well as unetched aluminum in MXenes materials, which are often overlooked when considering the activity and performance.
ADVANCED MATERIALS
(2023)
Article
Geochemistry & Geophysics
Renelle Dubosq, David A. Schneider, Alfredo Camacho, Baptiste Gault
Summary: The deformation mechanisms of garnet in the brittle-ductile regime under lower crustal conditions are still unclear. A study on garnet porphyroclasts from an eclogite facies mylonite in central Australia reveals that Fe segregation along grain boundaries of garnet leads to the nucleation of Fe-rich nanoclusters, which act as barriers for migrating dislocations, resulting in strain hardening and mechanical failure.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eric Woods, Mahander P. Singh, Se-Ho Kim, Tim M. Schwarz, James O. Douglas, Ayman A. El-Zoka, Finn Giulani, Baptiste Gault
Summary: This study focuses on the challenges of preparing cryogenic specimens for atom probe tomography (APT), and presents a generalized workflow for cryogenic specimen preparation. The workflow includes lift-out via focused ion beam and in situ deposition of capping layers to strengthen specimens and protect them during transfer. The study demonstrates the reliable in situ deposition of a metallic capping layer and showcases its significant improvement in atom probe data quality.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.
