1. Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore-641046, Tamil Nadu, India
2. Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
3. Department of Physics, Alagappa Chettiar College of Engineering, Karaikudi, 630 004, Tamil Nadu, India