1. Department of Materials Science (Glass and Ceramics)University of Erlangen‐NürnbergMartensstrasse 5D‐91058 ErlangenGermany
2. Nagoya Institute of TechnologyDepartment of Materials Science and EngineeringInstitute of Ceramics Research and EducationGokiso‐cho, Showa‐kuNagoya‐shi, Aichi466‐8555Japan
3. Frontier Research Institute for Materials ScienceNagoya Institute of TechnologyGokiso‐cho, Showa‐kuNagoya‐shi, Aichi466‐8555Japan