Title of article :
Photopyroelectric Spectrum of MNO2 Doped Bi2O3 - TiO2 - ZnO Ceramic Combination
Author/Authors :
Rizwan, Zahid National Textile University, Pakistan , Zakariaw, Azmi Universiti Putra Malaysia - Faculty oj Science - Department oj Physics, Malaysia , Mat Yunus, W. Mahmood Universiti Putra Malaysia - Faculty of Science and Environmental Studies - Department of Physics, Malaysia , Hashim, Mansor Universiti Putra Malaysia - Faculty oj Science - Department oj Physics, Malaysia , Shaari, Abdul Halim Universiti Putra Malaysia - Faculty of Science - Department of Physics, Malaysia
Abstract :
Photopyroelectric spectroscopy is used to study the energy band-gap of the ceramic (ZnO + 0.25 Bi2O3 +0.25 TiO2 + x MnO2 ) , x = 0 - 1.3 mol%, sintered at isothermal temperature 1190 and 1270°C for 2 hours in air. The wavelength of incident light, modulated at 9 Hz, is kept in the range of 300 to 800 nm and the photopyroelectric spectrum with reference to the doping level is discussed. The energy band-gap is estimated from the plot (phV)2VS hv and is 2.80 eV for the samples without MnO2 at both sintering temperatures. It decreases to 2.08 eV with a further increase of Mn02 • The phase constitution is determined by XRD analysis. Microstructure and compositional analysis of the selected areas are analyzed using SEM and EDX. The maximum relative density, 91.4 %, and the grain size, 47 μm, were observed in this ceramics combination.
Keywords :
Photopyroelectric , band gap , zinc oxide
Journal title :
Pertanika Journal of Science and Technology ( JST)
Journal title :
Pertanika Journal of Science and Technology ( JST)
