Research Data Repository of Saxon Universities
OPARA is the Open Access Repository and Archive for Research Data of Saxon Universities.
Researchers of Saxon Universities can either publish their research data on OPARA, or archive it here to comply with requirements of funding acencies and good scientic practice, without public access.
You can find the documentation of this service at the OPARA manual websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.
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Recent Submissions
Atomic scale structure and bond stretching force constants in stoichiometric and off-stoichiometric kesterites
(Universität Leipzig, 2026-07-14) Ritter, Konrad; Gurieva, Galina
This contains the data from figures and tables in: https://doi.org/10.1063/5.0169755 .
Data and simulations for green hydrogen development in Cameroon
(Technische Universität Bergakademie Freiberg, 2026-07-14) Brumme, Anja; Golub, Alexander; Markandya, Anil; Rübbelke, Dirk
We examine the conditions and consequences of establishing green hydrogen facilities in Cameroon. Using publicly available data, we develop a normative numerical model to identify potential trajectories for macroeconomic and environmental indicators. This dataset contains raw and processed data as well as simulation results and sensitivity analyses of key parameters.
Corrosion and Process Analysis of a Preoxidized MgO Recyclate-based Cermet Anode in Laboratory-Scale Na-Cryolite Molten Salt Electrolysis of Aluminum at 1000 °C
(Technische Universität Bergakademie Freiberg, 2026-07-14) Adamczyk, Alexander; Hossain, Farhan; Garcia Paz, Felipe A.; Yaroshevskyi, Serhii; Vogt, Daniel; Aneziris, Christos G.; Charitos, Alexandros
The development of inert anodes for aluminum electrolysis remains challenging due to the high corrosivity of cryolite-based melts at 950°C–1000°C. This study investigates the corrosion and process behavior of a carbon-free MgO–steel cermet anode derived from refractory recycling during laboratory-scale Na-cryolite electrolysis at 1000°C, focusing on the effect of a pre-oxidation treatment on its corrosion behavior. In the as-sintered state, MgO grains are mechanically bonded to a 316L steel matrix with interfacial porosity that limits corrosion resistance. Pre-oxidation at 900°C for 24 h forms a dense Mg–M–O (M=Fe, Cr) oxide-rich surface layer, sealing pores and improving resistance to cryolite infiltration, albeit at the cost of reduced electrical conductivity, which translated into an overall higher cell voltage compared to the as-sintered state. During electrolysis, this layer degrades under anodic polarization, O2 evolution, and fluorination. The surface transforms into a Fe–O-rich magnetite layer (Fe3O4), while a Cr-containing oxide and an in situ Mg–Fe–O transition zone form beneath, maintaining partial protection. Overall, pre-oxidation effectively delays electrolyte penetration by converting MgO into new oxide phases but introduces conductivity losses and surface instability. The results highlight both the potential and limitations of MgO-based cermet anodes for sustainable aluminum production.
GRK 2802: Investigation of Thermo-Chemical Processes in Commercial MgO-C Refractory Bricks With and Without MgO-C Recyclate at Elevated Temperatures
(Technische Universität Bergakademie Freiberg, 2026-07-10) Schramm, Alexander; Hubálková, Jana; Schimpf, Christian; Schemmel, Thomas; Aneziris, Christos G.; Weidner, Anja; Biermann, Horst
In the present study, the chemical processes occurring during high-temperature testing are investigated for two commercial MgO-C brick grades. One grade consists exclusively of virgin raw materials, while the other contains 47.5 wt.% MgO-C recyclate. High-temperature testing is conducted under argon atmosphere at ambient pressure using induction heating. To evaluate the effect of MgO-C recyclate incorporation on thermo-chemical processes, X-ray diffraction (XRD), electrothermal vaporization (ETV), differential thermal and thermogravimetric analysis (DTA/TG) coupled with mass spectrometry (MS) are applied. Scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD) provide phase characterization after exposure at 1300 °C and above. The results show that mechanisms typically occurring during the service of refractory materials such as the carbothermal reduction of magnesia, the incorporation of impurity phases into the newly formed MgO surface layer, and the deposition of calcium-rich phases and whisker-like structures also occur when MgO-C is exposed to the applied gas atmosphere. This confirms the relevance of the observed thermo-chemical processes and surface phase formation for real contact with molten steel and slag. Under the present test conditions, however, no significant influence of MgO-C recyclate incorporation on the thermo-chemical behavior of the coked MgO-C materials is detected.
Original research data of "Immediate Organic Room-Temperature Phosphorescence in Programmable Luminescent Tags Enabled by Oxygen-Free Fabrication"
(Technische Universität Dresden, 2026-07-08) Winkler, Lucy; Schellhammer, Sebastian; Reineke, Sebastian
Original research data to the following paper: Programmable luminescent tags (PLTs) exploit the oxygen sensitivity of room-temperature phosphorescence (RTP) from organic emitters to enable reversible information storage. In conventional PLTs, phosphorescence is initially quenched by oxygen incorporated during ambient processing. Upon UV irradiation, oxygen is photochemically consumed, activating RTP emission. While a single-use application is already commercially exploited in UV sensors, reusability is prevented by decreasing activation dose and RTP intensity over multiple activation cycles, which had previously been attributed to oxygen trapped during the fabrication process.
Here, we introduce an oxygen-free fabrication workflow that enables direct control of the oxygen content in PLTs and thereby allows systematic investigation of its role in the activation process. It is demonstrated that oxygen can diffuse out of the active layer under oxygen-free conditions, resulting in oxygen-free devices with immediate RTP emission. A comparison of the reusability of oxygen-free and conventional PLTs reveals similar behavior, indicating that photodegradation rather than trapped oxygen dominates long-term performance. In addition, thermal preconditioning of oxygen-free PLTs enables regulated oxygen re-entry, allowing the activation dose to be tuned without modifying the material composition or device architecture.
These findings clarify degradation processes in PLTs and establish a general framework for activation-tuned RTP in photonic devices.