1. Institute of Advanced Ceramics; Hamburg University of Technology (TUHH); Denickestraße 15 21073 Hamburg Germany
2. Institute of Nanostructure and Solid State Physics and Center for Hybrid Nanostructures; Universität Hamburg; Jungiusstraße 11B 20355 Hamburg Germany
3. Electron Microscopy Unit (BeEM); Hamburg University of Technology (TUHH); Eißendorfer Straße 42 21073 Hamburg Germany
4. Leibniz Institute for Solid State and Materials Research Dresden; Institute for Metallic Materials; Helmholtzstraße 20 01069 Dresden Germany