Affiliation: | a Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland b Slovak Academy of Sciences, Institute of Inorganic Chemistry, Dúbravská Cesta 9, 845 36 Bratislava, Slovak Republic c RUAG Technology, CH-6460 Altdorf, Switzerland |