title: Photopyroelectric spectroscopic studies of ZnO-MnO(2)-Co(3)O(4)-V(2)O(5) ceramics.
abstract: Photopyroelectric (PPE) spectroscopy is a nondestructive tool that is used to study the optical properties of the ceramics (ZnO + 0.4MnO(2) + 0.4Co(3)O(4) + xV(2)O(5)), x = 0-1 mol%. Wavelength of incident light, modulated at 10 Hz, was in the range of 300-800 nm. PPE spectrum with reference to the doping level and sintering temperature is discussed. Optical energy band-gap (E(g)) was 2.11 eV for 0.3 mol% V(2)O(5) at a sintering temperature of 1025 °C as determined from the plot (ρhυ)(2)versushυ. With a further increase in V(2)O(5), the value of E(g) was found to be 2.59 eV. Steepness factor 'σ(A)' and 'σ(B)', which characterize the slope of exponential optical absorption, is discussed with reference to the variation of E(g). XRD, SEM and EDAX are also used for characterization of the ceramic. For this ceramic, the maximum relative density and grain size was observed to be 91.8% and 9.5 μm, respectively.
authors.affiliation: Department of Physics, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; E-Mails: zahidrizwan64@gmail.com (Z.R.); mgm.sabri@gmail.com (M.S.M.G.).
authors.forename: Zahid
authors.initials: Z
authors.lastname: Rizwan
authors.forename: Azmi
authors.initials: A
authors.lastname: Zakaria
authors.forename: Mohd Sabri Mohd
authors.initials: MS
authors.lastname: Ghazali
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012666:Semiconductors; D013696:Temperature; D013816:Thermodynamics; D017968:Vanadium Compounds / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D017895:Manganese Compounds; D010087:Oxides; D017968:Vanadium Compounds; D003035:Cobalt; C027424:manganese oxide; C066075:vanadium pentoxide; D015034:Zinc Oxide; C060728:cobalt oxide