Dr. Eberhard Altstadt

Structural Material­s
Phone: +49 351 260 2276

Dr. Cornelia Kaden,
Phone: +49 351 260 3431

Structural Materials

We investigate the behavior of materials exposed to energetic particle irradiation. The work contributes to the program NUSAFE (Nuclear Waste Management, Safety and Radiation Research) of the Helmholtz Association.

Neutron irradiation provokes the formation and long-term evolution of nm-scale defects such as dislocation loops and solute atom clusters. These defects give rise to hardening accompanied by a reduced fracture resistance of reactor pressure vessel steels of running nuclear power plants. Materials for advanced reactor concepts will be exposed to higher operation temperatures and higher neutron doses. The overall objectives of our research are to identify the mechanisms of irradiation-induced damage in structural materials and to assess the resulting changes of the mechanical properties.

We work on two main directions:

  • In the case of running nuclear power plants, the work is focused on long-term irradiation effects in reactor pressure vessel steels.
  • Our work in the field of advanced reactor concepts is dedicated to ferritic/martensitic Cr-steels, oxide dispersion strengthened (ODS) steels and the emerging class of high-entropy alloys.

The new insight substantially contributes to the scientific background for the safety assessment of nuclear reactors. The work is embedded in the Euratom projects SOTERIA, MATISSE and M4F. A close cooperation with the Fundamentals and Simulation Group provides additional insight via atomistic simulation.

Our expertise:

Latest Publication

Preparation of Volborthite by a Facile Synthetic Chemical Solvent Extraction Method

Sánchez-Loredo, M. G.; Palomares-Sánchez, S. A.; Labrada-Delgado, G. J.; Helbig, T.; Chekhonin, P.; Ebert, D.; Möckel, R.; Owusu Afriyie, J.; Kelly, N.

In this work, the extraction of vanadium (V) ions from an alkaline solution using a commercial quaternary ammonium salt and the production of metal vanadates through precipitation stripping were carried out. The crystallization of copper vanadates from the extracts was performed using a solution containing a copper(II) source in concentrated chloride media as a stripping agent. In an attempt to control growth, a stabilizing polymer (polyvinylpyrrolidone, PVP) was added to the stripping solution. The structural characteristics of the crystallized products, mainly copper pyrovanadate (volborthite, Cu3V2O7(OH)2·(H2O)2) nanoflakes and nanoflowers and the experimental parameter influencing the efficiency of the stripping process were studied. From the results, the synthesis of nanostructured vanadates is a simple and versatile method for the fabrication of valuable three-dimensional structures providing abundant active zones for energy and catalytic applications.

Keywords: vanadium(V) extraction; anion exchange; quaternary ammonium salt; precipitation stripping; nanostructured vanadates; volborthite; polyvinylpyrrolidone



NameBld./Office+49 351 260Email
Dr. Eberhard Altstadt801/P1512276
Dr. Cornelia Kaden801/P1023431,


NameBld./Office+49 351 260Email
Dr. Frank Bergner801/P1503186
Dr. Jann-Erik Brandenburg801/P1522301
Dr. Paul Chekhonin801/P1462149
Mario Houska801/P1482242
Libang Lai801/P1533032
Jens Pietzsch801/P0322814
Dr. Andreas Ulbricht801/P1463155