1. Electronic Ceramics Department, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
2. Jozef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
3. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
4. Ceramics Laboratory, Swiss Federal Institute of Technology–EPFL, Lausanne 1015, Switzerland
5. Faculty of Electrical Engineering, University of Ljubljana, Trzaska cesta 25, 1000 Ljubljana, Slovenia