1. Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, Vienna 1060, Austria
2. University Service Center for Transmission Electron Microscopy, TU Wien, Wiedner Hauptstraße 8-10, Vienna 1040, Austria
3. Elettra-Sincrotrone Trieste S.C.p.A., SS 14 km 163.5 in AREA Science Park, Trieste 34149, Italy