Katharina Freiberg
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View article: Fabrication of shallow EUV gratings on silicon by irradiation with helium ions
Fabrication of shallow EUV gratings on silicon by irradiation with helium ions Open
To accurately achieve structure height differences in the range of single digit nanometres is of great importance for the fabrication of diffraction gratings for the extreme ultraviolet range (EUV). Here, structuring of silicon irradiated …
View article: Soft X-ray imaging with coherence tomography in the water window spectral range using high-harmonic generation
Soft X-ray imaging with coherence tomography in the water window spectral range using high-harmonic generation Open
High-harmonic generation (HHG) is used as a source for various imaging applications in the extreme ultraviolet spectral range. It offers spatially coherent radiation and unique elemental contrast with the potential for attosecond time reso…
View article: Tracing the Formation of Femtosecond Laser-Induced Periodic Surface Structures (LIPSS) by Implanted Markers
Tracing the Formation of Femtosecond Laser-Induced Periodic Surface Structures (LIPSS) by Implanted Markers Open
The generation of laser-induced periodic surface structures (LIPSS) using femtosecond lasers facilitates the engineering of material surfaces with tailored functional properties. Numerous aspects of their complex formation process are stil…
View article: Peculiarities in XPS spectra of Sn/SiO2 layers as an effect of surface charge
Peculiarities in XPS spectra of Sn/SiO2 layers as an effect of surface charge Open
X-ray photoelectron spectroscopy based on synchrotron radiation was used to investigate the composition of the observed SnO2-x/Sn:SiO2-x thin layer grown by organometallic chemical vapour deposition on single-crystalline silicon wafer with…
View article: Crystalline Microstructure, Microsegregations, and Mechanical Properties of Inconel 718 Alloy Samples Processed in Electromagnetic Levitation Facility
Crystalline Microstructure, Microsegregations, and Mechanical Properties of Inconel 718 Alloy Samples Processed in Electromagnetic Levitation Facility Open
The solidification of Inconel 718 alloy (IN718) from undercooled liquid is studied. The solidification kinetics is evaluated in melted and undercooled droplets processed using the electromagnetic levitation (EML) technique by the temperatu…
View article: Thermodynamically Guided Improvement of Fe–Mn–Al–Ni Shape‐Memory Alloys
Thermodynamically Guided Improvement of Fe–Mn–Al–Ni Shape‐Memory Alloys Open
A microstructural informed thermodynamic model is utilized to tailor the pseudoelastic performance of a series of Fe–Mn–Al–Ni shape‐memory alloys. Following this approach, the influence of the stability and the amount of the B 2‐ordered pr…
View article: Modelling of the Solidifying Microstructure of Inconel 718: Quasi-Binary Approximation
Modelling of the Solidifying Microstructure of Inconel 718: Quasi-Binary Approximation Open
The prediction of the equilibrium and metastable morphologies during the solidification of Ni-based superalloys on the mesoscopic scale can be performed using phase-field modeling. In the present paper, we apply the phase-field model to si…
View article: Improving Oxidation Resistance of Low Fe-Si Alloys by Preheating Treatment
Improving Oxidation Resistance of Low Fe-Si Alloys by Preheating Treatment Open
In this work, attempts have been made to improve the oxidation resistance of Fe-Si alloys with 0.5, 1.0 and 2.0 mass pct Si by a preheating treatment, which was carried out at 1073 K for 24 hours in high purity hydrogen atmosphere. Compare…
View article: Formation of Nanoscale Al2O3 Protective Layer by Preheating Treatment for Improving Corrosion Resistance of Dilute Fe-Al Alloys
Formation of Nanoscale Al2O3 Protective Layer by Preheating Treatment for Improving Corrosion Resistance of Dilute Fe-Al Alloys Open
In this work, an attempt was made to improve the corrosion resistance of dilute Fe-Al alloys (1.0 mass% Al) by preheating treatment at 1073 K in H2 atmosphere. In comparison with pure Fe and unpreheated Fe-Al alloys, the resistance to oxid…
View article: Characteristics of cracks formed at the surface of NiTi during a single cycle of pseudoelastic deformation
Characteristics of cracks formed at the surface of NiTi during a single cycle of pseudoelastic deformation Open
Pseudoelastic deformation of NiTi usually results in cracks at the surface. Cracking is promoted by surface oxide layers that form, e.g., during heat treatments required for shape-setting of minimally invasive implants. In connection with …
View article: Single Femtosecond Laser-Pulse-Induced Superficial Amorphization and Re-Crystallization of Silicon
Single Femtosecond Laser-Pulse-Induced Superficial Amorphization and Re-Crystallization of Silicon Open
Superficial amorphization and re-crystallization of silicon in and orientation after irradiation by femtosecond laser pulses (790 nm, 30 fs) are studied using optical imaging and transmission electron microscopy. Spectroscopic imaging el…
View article: Silicon surface amorphization and re-crystallization via single femtosecond laser pulses
Silicon surface amorphization and re-crystallization via single femtosecond laser pulses Open
Silicon is the material responsible for most of the technological developments during the past century, making it one of the most studied materials along different disciplines. However, there are still unturned stones regarding its superf…