1. Department of Physics
2. School of Natural Sciences (SNS)
3. National University of Science & Technology (NUST)
4. Islamabad 44000
5. Pakistan
6. State Key Laboratory for New Ceramics & Fine Processing
7. School of Materials Science & Engineering
8. Tsinghua University
9. Beijing 100084
10. China
11. Department of Chemical and Petroleum Engineering
12. United Arab Emirates University, (UAEU)
13. Al Ain
14. United Arab Emirates