1. Applied Chemistry Department; S. V. National Institute of Technology; Surat-395007, Gujarat India
2. Department of Biotechnology and Centre for Nanotechnology; Indian Institute of Technology Roorkee; Roorkee−247667, Uttarakhand India
3. Solid State Physics Division; Bhabha Atomic Research Centre, Trombay; Mumbai 400085 India
4. Australian Centre for Neutron Scattering; Australian Nuclear Science and Technology Organization, Lucas Heights; NSW 2234 Australia