1. Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 15, 45141 Essen, Germany
2. Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, 4422 Belvaux, Luxembourg
3. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Winterbergstraße 28, 01277 Dresden, Germany