1. Institute of Metallurgy, Solid State Kinetics Group, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany
2. Clausthal Centre of Material Technology, Clausthal-Zellerfeld 38678, Germany
3. Institute of Energy Research and Physical Technologies, Energy Conversion Group, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany