ISSN 2321-807X 3742 | Page June 05, 2015 BANDGAP ANALYSIS OF NANO CRYSTALLINE L0.1ZY0.9BCCO CERAMICS Anitha S. Nair 1 ,Reenu Jacob 2 , Sheelakumari Issac 3 , Sam Rajan 2 , V. S. Vinila 4 , D. J. Satheesh 4 , Jayakumari Isac 4* 1 Department of Physics, D. B. College, Parumala, India 2 Department of Physics, CMS College, Kottayam, India 3 Department of Chemistry, UC College, Aluva, India 4 Centre for Condensed Matter, Department of Physics, CMS College, Kottayam, India E-mail * corresponding author, email:drjayacmscollege@gmail.com, anithasateesh@gmail.com, mob: 9447781005 ABSTRACT Crystalline Ceramic Lanthanum Zirconium Yttrium barium Calcium Copper oxide(L0.1ZY0.9BCCO) was prepared by a high- energy ball milling process through mechanically assisted synthesis at a high temperature to acquire the desired homogeneity and phase formation. Inorder to study the optical properties like reflectivity, absorptivity, refractive index, the UV-VIS analysis of the above nonstochiometric sample was carried out. The dispersion of refractive index was analyzed by the Wemple-DiDomenico single-oscillator model.The band gap energy of the sample was elucidated from the Tauc plot. The refractive index n was calculated and the results obtained are plotted with the wavelength. Indexing terms/Keywords L0.1ZY0.9BCCO; Dispersion; Wemple-DiDomenico model; band gap energy; refractive index; Urbach energy. Academic Discipline And Sub-Disciplines Faculty of Science, Physics. SUBJECT CLASSIFICATION Condensed Matter Physics, Nano ceramics. TYPE (METHOD/APPROACH) Full Research Article – Experimental along with theory and analysis. Council for Innovative Research Peer Review Research Publishing System Journal: Journal of Advances in Chemistry Vol 11, No. 7 editorjaconline@gmail.com , www.cirjac.com