Affiliation: | 1. Department of PG Studies and Research in Physics , University Science College, Tumkur University , Tumkur 572 103, India bhushanvl@rediffmail.com;3. Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560 012, India;4. Department of Chemistry , M.S. Ramaiah Institute of Technology , Bangalore 560 054, India;5. Solid State and Structural Chemistry Unit , Indian Institute of Science , Bangalore 560 012, India |