1. Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstr. 6, 07743Jena, Germany
2. Institute of Glass and Ceramics, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058Erlangen, Germany
3. Institute of Physics, Augsburg University, Universitätsstr. 1, 86159Augsburg, Germany
4. Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635Athens, Greece
5. Faculty of Medicine and Health Technology, Tampere University, Korkeakoulunkatu 3, 33720Tampere, Finland