In this era of High temperature superconductors (HTS), having a lot of applications like high –voltage generator, Ceramic superconductor yttrium strontium bismuth copper oxide (YSBCO) was synthesized thermo chemically by solid state method at different treating temperatures. A characteristic feature of all solid-state reactions is that they involve the formation of product phase(s) at the interfaces of the reactants. UV-VIS analysis of the sample was carried out. Tunable band gaps can be obtained by varying annealing temperatures. The optical constants of refractive index, normal-incidence reflectivity, extinction coefficient, and absorption coefficient showed systematic variation with temperature. The dispersion of refractive index was analyzed by the Wemple- Di Domenico singleoscillator model. Urbach energy was elucidated from the raw data.
