Abstract
Optical and electrical properties is studied for (ZnO + 01MnO(2) + 0.4Co(3)O(4) + xBi(2)O(3) + yTiO(2)), where (x=0.6,1 & y=0.6,1mol%) using Photopyroelectric (PPE) spectroscopy that is nondestructive tool, incident light wavelength, kept in the range 300 nm-800 nm modulated at 10 Hz. The main objective of this study is to discuss the PPE spectrum based on doping level and sintering temperature. Optical energy band-gap (E-g) for x=0.6 and 1 mol% is 2.15 eV and 2.17 eV, respectively, which is calculated from the plot (rho hv)(2) versus hv at 1 hour sintering time. Steepness factor 'sigma A' and 'sigma B', is discussed with reference to the variation of E-g and sintering time which describe the slope of exponential+1 optical absorption. Other characterization for the ceramic were studied using XRD, EDAX and SEM. The relative density decreased with the increase of sintering time and doping level. It was investigated that the grain size increased with the increase of sintering time.