[1] AVC Coll Autonomous, Dept Phys, Mayiladuthurai 609305, Tamil Nadu, India
[2] Vel Tech Rangarajan Dr Sagunthala R&D Inst Science, Sch Sci & Humanities, Dept Phys, Chennai 600062, India
[3] Panimalar Engn Coll, Dept Phys, Chennai, Tamilnadu, India
[4] Jamia Millia Islamia, Dept Chem, New Delhi 110025, India
[5] King Saud Univ, Coll Sci, Dept Bot & Microbiol, POB 2455, Riyadh 11451, Saudi Arabia
[6] Karlsruhe Inst Technol, Inst Inorgan Chem, Engesserstr 15, D-76131 Karlsruhe, Germany
[7] Arignar Anna Govt Arts Coll, Dept Phys, Cheyyar 604407, Tamil Nadu, India