1. Institute of Geosciences and Geography, Mineralogy/Geochemistry, Martin Luther University Halle-Wittenberg, 06120 Halle, Germany
2. Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
3. Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), 21073 Hamburg, Germany