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Photopyro-electric spectroscopic studies of ZnO-MnO2-Co3O4-V2O5 ceramics.


Zakaria, Azmi and Rizwan, Zahid and Mohd Ghazali, Mohd Sabri (2011) Photopyro-electric spectroscopic studies of ZnO-MnO2-Co3O4-V2O5 ceramics. International Journal of Molecular Sciences, 12 (1). pp. 1625-1632. ISSN 1422-0067; ESSN:1422-0067


Photopyroelectric (PPE) spectroscopy is a nondestructive tool that is used to study the optical properties of the ceramics (ZnO + 0.4MnO2 + 0.4Co3O4 + xV2O5), 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 (Eg) was 2.11 eV for 0.3 mol% V2O5 at a sintering temperature of 1025 °C as determined from the plot (ρhυ)2 versus hυ. With a further increase in V2O5, the value of Eg was found to be 2.59 eV. Steepness factor ‘σA’ and ‘σB’, which characterize the slope of exponential optical absorption, is discussed with reference to the variation of Eg. 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.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3390/ijms12031625
Publisher: MDPI
Keywords: Photopyroelectric spectroscopy; ZnO; V2O5; Sintering; Secondory phase; Optical energy band-gap.
Depositing User: Nur Farahin Ramli
Date Deposited: 20 Aug 2013 07:00
Last Modified: 23 Nov 2015 02:07
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms12031625
URI: http://psasir.upm.edu.my/id/eprint/24925
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