1. Friedrich-Alexander University Erlangen-Nürnberg; Department of Materials Science; Glass and Ceramics; Martensstrasse 5 91058 Erlangen Germany
2. National Research Tomsk Polytechnic University; Lenin Av. 30 634050 Tomsk Russia
3. Institute of Strength Physics and Materials Science of Siberian Branch; Russian Academy of Sciences; 2/4, pr. Akademicheskii 634055 Tomsk Russia
4. Institute of Advanced Ceramics; Hamburg University of Technology; Denickestrasse 15, 21073 Hamburg Germany
5. Science and Technology on Thermostructural Composite Materials Laboratory; Northwestern Polytechnical University; Xi'an 710072 Shanxi P. R. China