TU Bergakademie Freiberg Data Publications

Permanent URI for this collectionhttp://opara.zih.tu-dresden.de/handle/123456789/21

Data publications from research of Freiberg University of Mining and Technology.

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GRK 2802: Hochtemperatur-Biegefestigkeit von kohlenstoffgebundenem Magnesiumoxid (MgO-C) unter Einbindung von DIC
(Technische Universität Bergakademie Freiberg, 2025-09-16) Schramm, Alexander; Knöchel, Lukas; Biermann, Horst; Weidner, Anja
Kohlenstoffgebundenes Magnesiumoxid (MgO-C) als Vertreter der Feuerfestwerkstoffe ist als Zustellungsmaterial in Konvertern, Stahlgießpfannen und Elektrolichtbogenöfen unverzichtbar. Der Werkstoff ist in der Anwendung komplexen thermischen, mechanischen und korrosiven Beanspruchungen ausgesetzt. Die Bewertung der quasi-statischen Hochtemperaturfestigkeit ist daher von zentralem Interesse und Gegenstand der vorliegenden Studie. Vier-Punkt-Biegeversuche an kommerziellem MgO-C Feuerfestmaterial wurden in einer Hochtemperaturprüfmaschine unter Schutzgas bis 1300°C durchgeführt. Mittels digitaler Bildkorrelation (DIC) bei Raumtemperatur wurden Aussagen zu ablaufenden Schädigungsmechanismen gemacht. Die in dieser Studie durchgeführten Versuche lieferten bei erhöhten Temperaturen höhere Biegefestigkeiten als bei Raumtemperatur, was auf das Schließen von Rissen entlang der Grenzfläche zwischen MgO und kohlenstoffhaltiger Matrix zurückgeführt wird.
Open Access
Research data for journal article: On the correlatability of thermodynamic and spectroscopic ideal and real behaviour: Excess Gibbs energy vs Raman spectra
(Technische Universität Bergakademie Freiberg, 2025-09-12) Willger, Miriam
With this data it was investigated whether Raman spectra of binary mixtures can be linked to thermodynamic properties such as the molar excess Gibbs energy and activity coefficients. No correlation between excess molar or partial molar Raman intensities and these thermodynamic parameters was found, and it was shown that peak shifts do not necessarily indicate deviations from ideal mixture behaviour. Details on the Voigt modelling procedure can be found in the Supporting Information of the related journal article.
Open Access
Research data for: "Guest Particle Deformation and Powder Flow Behavior in Mechano-Fusion: Linking Microscopic Structure to Macroscopic Performance"
(Technische Universität Bergakademie Freiberg, 2025-09-09) Seyffer, Judith Miriam
The research data set comprises the process data of mechano-fusion experiments (machine raw data and experiment meta data) and measurement data of different characterization methods (laser diffraction, BET specific surface area, powder flowability) for the investigated particle samples after mechano-fusion. The data corresponds to the publication "Guest Particle Deformation and Powder Flow Behavior in Mechano-Fusion: Linking Microscopic Structure to Macroscopic Performance" by Seyffer et al. (2025). Further information can be found in the provided Readme file and in the corresponding publication.
Public Metadata
GRK 2802: HIGH-TEMPERATURE COMPRESSION TESTS AND ACCOMPANYING SEM INVESTIGATIONS OF MgO-C REFRACTORIES BASED ON FRESH MgO AND RECYCLATE
(Technische Universität Bergakademie Freiberg, 2025-08-27) Schramm, Alexander; Weidner, Anja; Biermann, Horst; Stadtmüller, Till M. J.; Aneziris, Christos G.; Schemmel, Thomas
With regard to the increasingly desired recycling of refractories, the properties of MgO-C containing recyclate are of high economic and ecological relevance. Two commercially available grades were studied to evaluate the influence of recyclate in MgO-C materials: MgO-C consisting only of fresh MgO as well as MgO-C with 50 wt.% recyclate. In this study, compression tests on these MgO-C materials were performed at room temperature, 1000°C and 1300°C. In order to investigate the microstructure and to identify the occurring damage mechanisms, scanning electron microscopy (SEM) investigations were carried out. The compression tests provided higher strengths at room temperature and at 1000°C for the MgO-C grade with recyclate compared to the grade with only fresh MgO and comparable strengths at 1300°C. Thus, the use of recycled agglomerates had no negative effect on the compressive strength.
Open Access
Dataset for "CFD Analysis of Mucus Bridge Instability and Breakup in the Vocal Folds"
(Technische Universität Bergakademie Freiberg, 2025-08-22) Heinrich, Martin
This data archive accompanies the research paper "CFD Analysis of Mucus Bridge Instability and Breakup in the Vocal Folds" by Heinrich et al. The archive contains OpenFOAM case setups, simulation scripts, and extracted visualization data for the multiphase Volume-of-Fluid CFD simulation of mucus bridge breakup during vocal fold phonation.
Open Access
Dataset Supporting the Characterization of Slag from SOEL Interconnect Remelting
(Technische Universität Bergakademie Freiberg, 2025-08-13) Mongoljiibuu, Shine-Od
This dataset supports the manuscript titled “Chromium in Slag from SOEL Interconnects Remelting: Characterization and Recycling Potential”. The study focuses on characterizing the bulk composition, mineralogy, its distribution, and elemental distributions in slag generated during the remelting of Solid Oxide Electrolyzer (SOEL) interconnects. The data include X-ray Fluoroscence (XRF) data, X-ray Diffraction (XRD) pattern data, X-ray Computed Tomography (XCT) dataset, and Scanning Electron Microscopy (SEM)-based Mineral Liberation Analysis dataset.
Open Access
Multiple superconducting transitions in Yb$_{3+x}$Co$_4$Sn$_{13-x}$
(Technische Universität Bergakademie Freiberg, 2025-07-31) Meret, Orlob; Levytskyi, Volodymyr; Tsirlin, Alexander; Kundys, Bohdan; Sturm, Elena; Leithe-Jasper, Andreas; Gumeniuk, Roman
Abstract of the accompanying article: In the Yb-Co-Sn system a Remeika phase Yb$_{3+x}$Co$_{4}$Sn$_{13-x}$ is found with solid solution extending within $0\le\,x\,\le0.5$. All these compounds crystallize with primitive cubic [space group $Pm\bar{3}n$, $a\approx9.54$ \AA] strongly disordered Sc$_{3}$Ir$_4$Si$_{13+x}$ type. Stoichiometric Yb$_3$Co$_4$Sn$_{13}$ is a superconductor with critical temperature $T_c\,=\,3.1(2)$\,K, lower- [$B_\mathrm{c1}=1.90(2)$\,mT] and upper [$B_\mathrm{c2}=2.16(5)$\,T] critical fields. The specific heat jump $\Delta c_p/\gamma T_c\,=\,1.72(9)$ together with the fact that $B_\mathrm{c2}(T_c)$ dependence is described by the Werthamer-Helfand-Hohenberg (WHH) model hint towards a conventional mechanism with a weak electron-phonon coupling. Although a more precise analysis is hampered by the presence of multiple superconducting transitions observed in the specific heat of this Remeika phase, the non-stoichiometric Yb$_{3.2}$Co$_4$Sn$_{12.8}$ reveals $T_c\,=\,2.4(2)$\,K and $B_\mathrm{c2}=4.79(9)$\,T exceeding the classical Pauli limit. Strong electron-phonon coupling in this superconductor is confirmed by the high value of the $\lambda_\mathrm{AD}=0.92(2)$ parameter determined from the Allen-Dynes formula. However, the electronic specific heat of Yb$_{3.2}$Co$_4$Sn$_{12.8}$ follows the exponential law [$c_\mathrm{el}(T)\propto e^{-\Delta(0)/k_\mathrm{B}T}$] and can be described by the $\alpha$-model [$\alpha\equiv\Delta(0)/k_\mathrm{B}T_c=2$] indicating this stannide to be a conventional BCS-superconductor. Both Yb$_{3+x}$Co$_{4}$Sn$_{13-x}$ ($x=0, 0.2$) compounds reveal complex phonon spectra with possible `rattling' behavior. They are also found to be metallic systems, some aspects of which can be described by a free electron gas model.
Open Access
Research data on measured solubility of insect fat in compressed CO2
(Technische Universität Bergakademie Freiberg, 2025-06-12) Goldberg, Tom; Herdegen, Volker
The data file ('Solubility data.txt') contains the measured solubility data of insect fat (Black soldier fly larvae, Hermetia illucens) in compressed CO2 according to the publication "Solubility of insect fat in compressed CO2: Experiments and density- as well as activity-based modeling" by Goldberg, T. & Herdegen, V. (2025). Measurements were conducted at 4 set temperatures (298, 315, 336, 353 K) over a wide pressure range (15 to 60 MPa). The dataset includes all measured solubilities, each determined in at least duplicate, together with the corresponding temperature and pressure conditions (means and standard deviations). The given CO2 densities were calculated using the Bender equation of state, with their maximum fluctuation range resulting from the standard deviations in temperature and pressure. Except for 3 selected data points that refer to the crude insect fat (attached at the end of the file), all measurements were performed using the pre-cleaned insect fat obtained from liquid-liquid extraction with hexane and water. Further information on physicochemical properties and the fatty acid profile of the insect fat, as well as a detailed description of the experimental procedure, can be found in the associated publication.
Open Access
Supplementary information to the publication “Influence of foam composite in lithium-ion battery packs on their mechanical recycling”
(Technische Universität Bergakademie Freiberg, 2025-05-23) Rademacher, Paul; Kaas, Alexandra; Wilke, Christian; Peuker, Urs A.
Supplementary data to the following paper. Lithium-ion batteries (LIB) make an important contribution to the energy transition as energy storage devices for mobile and stationary applications. The recovery of the valuable materials contained in the lithium-ion batteries after their end of life is of central importance for the development of a circular economy in line with the concept of sustainability. Mechanical recycling is to be seen as a first step in this process. With processes for the mechanical recycling of LIB that have already been successfully developed and implemented, it is possible to recover most components of a LIB i.e., the materials of the anode, cathode and separator foils as well as the casing. The concentrate of the coating of the electrode foils, which is called black mass, becomes an intermediate product for hydrometallurgical recycling processes for the recovery of lithium, among other materials. Some OEM of the automotive industry are about to introduce cell-to-pack-technologies, in which individual LIB-cells are fixed and stabilised in their position inside the large battery pack with the aid of a foam material, thereby adding further materials to the battery pack. The effects of the foam on the recycling are not known yet. Within the scope of this experimental work, several technological variants to enrich and separate the foam as an individual material fraction were investigated. The holistic aim is to minimise contamination from the foam in the valuable fractions. Two different types of foam and their effect on the purity of the recycling products were analysed.
Open Access
Variable total strain amplitude loading of 316L
(Technische Universität Bergakademie Freiberg, 2025-05-09) Szlosarek, Robert; Henkel, Sebastian; Nitzsche, Pia
This project investigates the behaviour of steel 316L under variable total strain amplitude loading, with a focus on understanding the material's response to complex loading conditions. Quasistatic tensile testing and fully reversed constant amplitude fatigue tests were conducted to characterize the material's properties. The variable amplitude tests were performed under total strain control, and the resulting stress-strain hysteresis loops were analysed to reveal the occurrence of mean stress after a drop in strain amplitude. Notably, the sign of the mean stress depends on the direction of strain transition between the tensile and compression domains. Furthermore, an ideal plastic material behaviour was observed after strain increase accompanied by mean stress. To facilitate further research and model development, the experimental data are published in combination with a research paper: Variable strain amplitude loading of steel 316L – experimental results and analytical modelling
Open Access
Particle image velocimetry inside in-axis and off-axis stretched Newtonian liquid bridges
(Technische Universität Bergakademie Freiberg, 2025-05-06) Fritzsche, Lisa; Bauer, Katrin
Supplemental material for the publication: "Particle image velocimetry of the flow field inside in-axis and off-axis stretched liquid bridges" by Fritzsche, L., Bauer, K., & Schwarze, R. (2025). The study introduces a novel experimental technique that enables comprehensive visualization and measurement of the internal flow field of liquid bridges throughout the stretching process. By embedding the liquid bridge in a refractive-index-matched immiscible outer liquid phase, unobstructed optical access to the entire volume is provided and optical distortions are eliminated. The data collection archived here contains the time-resolved PIV data (velocity fields) for all cases discussed in the publication, raw images for two representative cases (plate speeds 5 mm/s), and evaluated minimum diameters over time (including raw images) for liquid-air systems to compare to the liquid-liquid system of the PIV measurements.
Open Access
Granule size and shape data from SOPAT for publication "Impact of Feed Rate and Binder Concentration on the Morphology of Spray Dried Alumina-Polymer Nano-composites"
(Technische Universität Bergakademie Freiberg, 2025-04-24) Mitra, Rahul
This dataset comprises in-line experimental SOPAT data from spray drying investigations of alumina and polyvinylpyrrolidone-30 composite granules. The spray drying process outcomes are documented through inline optical images of dried granules obtained via a SOPAT in-line imaging system providing maximum and minimum Feret diameter and aspect ratio information.
Open Access
Micro-CT data for SPP 2364 "Model-based control of spray synthesis of structured granules with specified properties using transfer functions derived by multivariate stochastic models and machine learning"
(Technische Universität Bergakademie Freiberg, 2025-04-23) Mitra, Rahul
The data set comprises the micro-CT data from the 1st funding period of the SPP 2364, project number 504580586. The data published here contains the raw, reconstructed micro-CT images of the two spray dried samples (at two different feed rates) tested. The scans were done using the Zeiss Xradia Versa 510.
Open Access
Research data for: "Penetration depth and effective sample size characterization of UV/Vis radiation into pharmaceutical tablets"
(Technische Universität Bergakademie Freiberg, 2025-03-20) Seyffer, Judith Miriam; Fuchs, Lukas
The data set comprises the micro-CT data for the publication Brands et al. (2025). In a joint work within the 1st funding period of the SPP2364, the three-dimensional distribution of the active ingredient in pharmaceutical tablets is investigated using a segmented CT image data set of a tablet. The data published here contains the raw, reconstructed micro-CT image data after acquisition using the Zeiss Xradia Versa 510. Imaging was performed by stitching five individual, overlapping region of interest scans over the full width of the tablet. Additionally, the data set of the segmented active ingredient particles is included in a downscaled version. Further information can be found in the corresponding publication "Penetration depth and effective sample size characterization of UV/Vis radiation into pharmaceutical tablets".
Open Access
Influence of shredder and mill settings on the material recoveries and product qualities of a two-stage mechanical recycling process of automotive lithium-ion batteries
(Technische Universität Bergakademie Freiberg, 2025-03-12) Kaas, Alexandra; Wilke, Christian; Peuker, Urs
For a two stage shredding and milling process the yield of black mass and the elemental recovery of critical elements Ni and Li s investigated. I can be shown that the quality of the products resulting from the mechanical recycling of lithium-ion batteries significantly depends upon the parameters employed during the shredding process. Modifications to the settings have the potential to exert a considerable impact on the particle size, liberation of composites and de-coating of electrodes. The discharge grid size employed during the first shredding step shows a significant influence on the downstream separation behaviour of the casing material and separator foil. The mill speed utilised during the second comminution step determines the separation achieved between the cathode and anode. A reduction in grid size employed during the first shredding stage results in an increase in black mass yield, although the recovery of the casing is diminished. In total Ni recovery for all setting combinations is similar, a lower recovery in the first shredding step is compensated by a higher recovery after the second comminution. It was observed that an overall increase in the mill speed above 1750 rpm resulted in elevated levels of copper contamination within the black mass. The influence of eleven distinct combinations of shredder and mill settings on the black mass yield and its composition, the recovery of the separator foil and the casing, as well as the separation behaviour of the anode and cathode, were investigated.
Open Access
Correlation Velocimetry inside a model of the human airways
(Technische Universität Bergakademie Freiberg, 2025-02-07) Bauer, Katrin; Kluwe, Moritz Niklas
The dataset corresponds to the publication "Deterministic periodic structures in a model of the human airways" by Kluwe et al. 2025. It contains raw data obtained from an optical setup used for point-wise velocity measurements using Correlation Velocimetry in a model of human airways. The recorded data consists of stereo audio files sampling the photo-electric response of two photodiodes to the passage of tracer particles. The time lag between both signals corresponds to the mean time of flight of ensembles of particles between both detectors. Using the known distance between the detectors (272 micrometers), the mean velocity of the tracer particles can be calculated. This dataset includes the raw data evaluated and discussed in the publication.
Open Access
Robust Laser Cross Detection
(Technische Universität Bergakademie Freiberg, 2024-12-12) Kluwe, Moritz Niklas; Hardege, Robert
The source code repository contains the complete Python implementation of the laser cross detection algorithm, including example datasets. The repository includes synthetic image generation tools, evaluation scripts, and reference implementations of RANSAC and Probabilistic-Hough-Transform methods for comparison. Example datasets feature both synthetic and real-world calibration images, with documentation detailing their usage. All code is thoroughly commented and includes usage examples. The implementation requires common Python libraries (numpy, scipy, lmfit) and provides a straightforward API for integration into existing calibration workflows.
Open Access
Influence of a pyrolysis at different temperatures on the mechanical recycling efficiency of Li-ion batteries
(Technische Universität Bergakademie Freiberg, 2024-12-12) Kaas, Alexandra; Wilke, Christian; Born, Jannik; Ahuis, Marco; Kwade, Arno; Peuker, Urs
The integration of a pyrolysis stage into the mechanical recycling process of Li-ion batteries is supposed to improve the decoating of the electrodes, the recovery of valuable components and the overall quality of the products. The effectiveness of the pyrolysis process depends on the applied temperature as the various components of a Li-ion battery melt, evaporate and decompose at different temperatures. The decomposition temperature of the cathode binder is a crucial factor in the thermal mechanical recycling process. Temperatures below this threshold have a negative impact on the recovery rates, as the melting of binder and plastics reduces the efficiency of the recovery process. Conversely, higher temperatures facilitate the recovery of the cathode coating metals (Ni, Co, Li) into the black mass. The majority of the metals (92-98%) are recovered and, following hydrometallurgical treatment, can be reused for cell production, thereby closing the loop and reducing the consumption of raw materials and enhancing the sustainability of batteries. Moreover, the decomposition of the organic components, including binders and plastics, improves the quality of the products, thereby reducing the necessity and extent of further treatment.
Open Access
Research data for: “Forces during film drainage and detachment of NMC and spherical graphite in particle-bubble interactions quantified by CP-AFM and modeling to understand the salt flotation of battery black mass”
(Technische Universität Bergakademie Freiberg, 2024-12-09) Nicklas, Jan
This dataset characterizes the particle-bubble interaction for single battery black mass particles (NMC 622 and spherical graphite) in sodium chloride solutions (0.001 mol/L to 0.750 mol/L) for pH 3 to pH 10. The interaction of black mass particles with gas bubbles in the AFM-geometry gives information about the likeliness of particle-bubble-attachment and detachment in salt flotation. The research data consists of two parts: A) the Experimental Atomic Force Microscopy data for the interaction of black mass particles (NMC 622 (NMC) and spherical graphite (SG)) with sessile gas bubbles in salt solutions and B) the Data for the key figures of “Forces during film drainage and detachment of NMC and spherical graphite in particle-bubble interactions quantified by CP-AFM and modeling to understand the salt flotation of battery black mass”.
Open Access
Supplementary data for “Computational workflow for the characterization of size, shape and composition of particles and their separation behavior during processing“
(Technische Universität Bergakademie Freiberg, 2024-12-06) Leißner, Thomas
The data set comprises the raw data for the publication Weber et al. (2025). It contains the reconstructed volume graphics (tif-image stack) of the feed material and both products of magnetic separation. The tomograms were recorded with the Zeiss Xradia 510 Versa X-ray microscope. Measurement and reconstruction parameters can be found in the readme file. The false color images of the SEM-EDS from the Mineral Liberation Analyzer are also included. Further information can be found in the corresponding publication Weber et al. (2025) "Computational workflow for the characterization of size, shape and composition of particles and their separation behavior during processing."

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