1. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology
2. School of Materials Science and Engineering
3. Xi’an University of Technology
4. Xi’an 710048
5. P. R. China
6. Department of Materials and Earth Science
7. Technical University of Darmstadt
8. FG Nichtmetallisch-Anorganische Werkstoffe
9. 64287 Darmstadt
10. Germany
11. FG Elektronenstruktur von Materialien