Constantinos Hatzoglou
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View article: Directed energy deposition of aluminium bronze onto H13 steel-microstructure in multi-material additive manufacturing
Directed energy deposition of aluminium bronze onto H13 steel-microstructure in multi-material additive manufacturing Open
View article: Local p‐ and n‐Type Doping of an Oxide Semiconductor via Electric‐Field‐Driven Defect Migration
Local p‐ and n‐Type Doping of an Oxide Semiconductor via Electric‐Field‐Driven Defect Migration Open
Layered oxides exhibit high ionic mobility and chemical flexibility, attracting interest as cathode materials for lithium‐ion batteries and the pairing of hydrogen production and carbon capture. Recently, layered oxides emerged as highly t…
View article: Atomic-scale insights on grain boundary segregation in a cathode battery material
Atomic-scale insights on grain boundary segregation in a cathode battery material Open
View article: Atomic-scale insights on grain boundary segregation in a cathode battery material
Atomic-scale insights on grain boundary segregation in a cathode battery material Open
The grain boundary segregation of the Co-free pristine spinel LiNi0.5Mn1.5O4 cathode material has been studied by transmission electron microscopy and atom probe tomography. The segregation of Mn and the depletion of Ni at grain boundaries…
View article: Effect of Dynamic Reconstruction on Particle Size and Morphology in Atom Probe Tomography
Effect of Dynamic Reconstruction on Particle Size and Morphology in Atom Probe Tomography Open
Atom probe tomography enables three-dimensional mapping of elements within material volumes with subnanometer resolution. Standard tomographic reconstruction methods rely on simplified assumptions regarding key parameters such as the field…
View article: Local doping of an oxide semiconductor by voltage-driven splitting of anti-Frenkel defects
Local doping of an oxide semiconductor by voltage-driven splitting of anti-Frenkel defects Open
Layered oxides exhibit high ionic mobility and chemical flexibility, attracting interest as cathode materials for lithium-ion batteries and the pairing of hydrogen production and carbon capture. Recently, layered oxides emerged as highly t…
View article: Chemical composition dependent atom clustering during natural aging in Al-Mg-Si alloys
Chemical composition dependent atom clustering during natural aging in Al-Mg-Si alloys Open
View article: Accelerating precipitation hardening by natural aging in a 6082 Al-Mg-Si alloy
Accelerating precipitation hardening by natural aging in a 6082 Al-Mg-Si alloy Open
View article: Inoculating solid-state homogeneous precipitation by impurity atoms through a spinodal decomposition like pathway
Inoculating solid-state homogeneous precipitation by impurity atoms through a spinodal decomposition like pathway Open
Solid-state homogeneous precipitation of nano-sized precipitates is one of the most effective processes to strengthen metal alloys, where the final density and size distribution of precipitates are largely controlled by the precipitation k…
View article: Inoculating solid-state homogeneous precipitation by impurity atoms through a spinodal decomposition like pathway
Inoculating solid-state homogeneous precipitation by impurity atoms through a spinodal decomposition like pathway Open
Solid-state homogeneous precipitation of nano-sized precipitates is one of the most effective processes to strengthen metal alloys, where the final density and size distribution of precipitates are largely controlled by the precipitation k…
View article: 3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure
3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure Open
Oxide heterostructures exhibit a vast variety of unique physical properties. Examples are unconventional superconductivity in layered nickelates and topological polar order in (PbTiO 3 ) n /(SrTiO 3 ) n superlattices. Although it is clear …
View article: Crystallographic dependence of Field Evaporation Energy Barrier in metals using Field Evaporation Energy Loss Spectroscopy mapping
Crystallographic dependence of Field Evaporation Energy Barrier in metals using Field Evaporation Energy Loss Spectroscopy mapping Open
Atom probe tomography data is composed of a list of coordinates of the reconstructed atoms in the probed volume. The elemental identity of each atom is derived from time-of-flight mass spectrometry, with no local energetic or chemical info…
View article: Deflecting Dendrites by Introducing Compressive Stress in Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Using Ion Implantation (Small 12/2024)
Deflecting Dendrites by Introducing Compressive Stress in Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Using Ion Implantation (Small 12/2024) Open
Compressive stress is caused in Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 by implanting Ag ions into the near surface region.This compressive stress enables the deflection of mechanically induced cracks, created via nano-indentation as well as growin…
View article: On the Use of a Cluster Identification Method and a Statistical Approach for Analyzing Atom Probe Tomography Data for GP Zones in Al–Zn–Mg(–Cu) Alloys
On the Use of a Cluster Identification Method and a Statistical Approach for Analyzing Atom Probe Tomography Data for GP Zones in Al–Zn–Mg(–Cu) Alloys Open
Early-stage clustering in two Al–Mg–Zn(–Cu) alloys has been investigated using atom probe tomography and transmission electron microscopy. Cluster identification by the isoposition method and a statistical approach based on the pair correl…
View article: Atomic Structure of Hardening Precipitates in Al–Mg–Si Alloys: Influence of Minor Additions of Cu and Zn
Atomic Structure of Hardening Precipitates in Al–Mg–Si Alloys: Influence of Minor Additions of Cu and Zn Open
Shifting toward sustainability and low carbon emission necessitates recycling. Aluminum alloys can be recycled from postconsumer scrap with approximately 5% of the energy needed to produce the same amount of primary alloys. However, the pr…
View article: Deflecting Dendrites by Introducing Compressive Stress in Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Using Ion Implantation
Deflecting Dendrites by Introducing Compressive Stress in Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Using Ion Implantation Open
Lithium dendrites belong to the key challenges of solid‐state battery research. They are unavoidable due to the imperfect nature of surfaces containing defects of a critical size that can be filled by lithium until fracturing the solid ele…
View article: The effect of grain size and rolling reduction on microstructure evolution and annealing hardening response of a Mg-3Gd alloy
The effect of grain size and rolling reduction on microstructure evolution and annealing hardening response of a Mg-3Gd alloy Open
Mg-3Gd (wt.%) samples with different initial grain sizes were prepared to evaluate the grain size effect on microstructural evolution during cold rolling and subsequent annealing hardening response. The deformation behavior and mechanical …
View article: On the use of a cluster identification method and a statistical approach for analyzing atom probe tomography data for GP zones in Al-Zn-Mg(-Cu) alloys
On the use of a cluster identification method and a statistical approach for analyzing atom probe tomography data for GP zones in Al-Zn-Mg(-Cu) alloys Open
View article: Beyond Atom Mapping in Atom Probe Tomography Using Field Evaporation Energy Loss Spectroscopy
Beyond Atom Mapping in Atom Probe Tomography Using Field Evaporation Energy Loss Spectroscopy Open
International audience
View article: Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide
Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide Open
Polar discontinuities, as well as compositional and structural changes at oxide interfaces can give rise to a large variety of electronic and ionic phenomena. In contrast to earlier work focused on domain walls and epitaxial systems, this …
View article: 3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO$_3$)$_9$/(LuFe$_2$O$_4$)$_1$ superlattices
3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO$_3$)$_9$/(LuFe$_2$O$_4$)$_1$ superlattices Open
Oxide heterostructures exhibit a vast variety of unique physical properties. Examples are unconventional superconductivity in layered nickelates and topological polar order in (PbTiO$_3$)$_n$/(SrTiO$_3$)$_n$ superlattices. Although it is c…
View article: Deflecting dendrites by introducing compressive stress in Li7La3Zr2O12 using ion implantation
Deflecting dendrites by introducing compressive stress in Li7La3Zr2O12 using ion implantation Open
Lithium dendrites belong to the key challenges of solid-state battery research. They are unavoidable due to the imperfect nature of surfaces containing defects of a critical size that can be filled by lithium until fracturing the solid ele…
View article: Correlating laser energy with compositional and atomic-level information of oxides in atom probe tomography
Correlating laser energy with compositional and atomic-level information of oxides in atom probe tomography Open
View article: Mesoscopic modeling of field evaporation on atom probe tomography
Mesoscopic modeling of field evaporation on atom probe tomography Open
Reconstructions in atom probe tomography (APT) are biased by image distortions arising from dynamic changes of the specimen geometry that controls image projection. Despite the strong efforts to build realistic models for understanding and…
View article: Introducing a Dynamic Reconstruction Methodology for Multilayered Structures in Atom Probe Tomography
Introducing a Dynamic Reconstruction Methodology for Multilayered Structures in Atom Probe Tomography Open
Atom probe tomography (APT) is a powerful three-dimensional nanoanalyzing microscopy technique considered key in modern materials science. However, progress in the spatial reconstruction of APT data has been rather limited since the first …
View article: Introducing field evaporation energy loss spectroscopy
Introducing field evaporation energy loss spectroscopy Open
Retrieving information on the chemical and bonding states of atoms in a material in three-dimensions is challenging even for the most advanced imaging techniques. Here, we demonstrate that this information is accessible via straight-flight…
View article: Optimizing compositional and atomic-level information of oxides in atom probe tomography
Optimizing compositional and atomic-level information of oxides in atom probe tomography Open
Atom probe tomography (APT) is a 3D analysis technique that offers unique chemical accuracy and sensitivity with sub-nanometer spatial resolution. Recently, there is an increasing interest in the application of APT to complex oxides materi…
View article: Clustering and Precipitation during Early-Stage Artificial Aging of Al–Si–Mg(–Cu) Foundry Alloys
Clustering and Precipitation during Early-Stage Artificial Aging of Al–Si–Mg(–Cu) Foundry Alloys Open
High-Si aluminum foundry alloys are an important material class for products with complex 3D geometries where casting is the most suitable production method. With Mg and/or Cu additions, these alloys gain strength upon heat treatment due t…
View article: The evolution of precipitates in an Al–Zn–Mg alloy
The evolution of precipitates in an Al–Zn–Mg alloy Open
The precipitation sequence in Al–Zn–Mg alloys has been subject to many revisions over the years as more structural details of the early-stage Guinier-Preston (GP) zones and precipitates have been uncovered. To further investigate this, a 7…
View article: The Evolution of Precipitates in an Al-Zn-Mg Alloy
The Evolution of Precipitates in an Al-Zn-Mg Alloy Open