Affiliation: | 1. Technical Mineralogy Group, Institute of Mineralogy and Petrography, University of Fribourg, Pérolles, Ch. du Musée 6, CH‐1700 Fribourg, Switzerland;2. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, CH‐8600 Duebendorf, Switzerland;3. Empa, Swiss Federal Laboratories for Materials Testing and Research, Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH‐3602 Thun, Switzerland |