1. Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH8, Bandarsindri, Ajmer-305817, India
2. Department of Physics, School of Physical Sciences, Central University of Rajasthan, NH8, Bandarsindri, Ajmer-305817, India
3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India