1. Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK), Microstructure and Properties of Materials (IEK-2), 52425 Jülich, DE (Corresponding author), e-mail: b.kuhn@fz-juelich.de
2. E.ON New Build & Technology GmbH, Alexander-von-Humboldt-Straße 1, 46896 Gelsenkirchen, DE.
3. Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK), Microstructure and Properties of Materials (IEK-2), 52425 Jülich, DE.