1. Laboratory
for Multifunctional Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
2. The European Synchrotron Research Facility, CS40220, 38043 Grenoble Cedex 9, France
3. Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany