1. PG & Research Department of Physics, Pachaiyappa’s College, Chennai, India
2. Department of Physics, Panimalar Engineering College, Chennai, India
3. Department of Physics, National Institute of Technology, Warangal, India
4. Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, University of Concepcion, Concepcion, Chile
5. Technological Development Unit (UDT), University of Concepcion, Coronel, Chile