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Effect of sintering temperature on the photothermal spectrum of Bi2O3 - TiO2 - Co3O4 - ZnO ceramics


Citation

Rizwan, Zahid and Zakaria, Azmi and Hashim, Mansor and Shaari, Abdul Halim and Mat Yunus, Wan Mahmood (2007) Effect of sintering temperature on the photothermal spectrum of Bi2O3 - TiO2 - Co3O4 - ZnO ceramics. In: International Conference on Advancement of Materials and Nanotechnology 2007 (ICAMN 2007), 29 May-1 June 2007, Langkawi, Kedah. (pp. 530-534).

Abstract

Photopyroelectric spectroscopy is used to study the band‐gap energy of the ceramic ZnO+0.5 Bi2O3+0.5 TiO2+0.4 Co3O4 (mol%), sintered at the isothermal temperature 1180 and 1210, 1240, 1270, 1300° C for 1 and 2 hours in air. The wavelength of incident light, modulated at 9 Hz, is kept in the range 300 to 800 nm and the photopyroelectric spectrum with reference to the doping level is discussed. The band‐gap energy is estimated from the plot (ρhν)2 vs hν and is 2.30 eV at 1180° C for 1 hour sintering time and is reduced to 2.15 eV at 1300° C sintering temperature. Eg is constant at about 2.8 eV at all sintering temperatures for 2 hours sintering time. The steepness factor σA (in A region) and σB (in B region) which characterizes the slop of exponential optical absorption is discussed with reference to the sintering temperature. The phase constitution is determined by XRD analysis. Microstructure and compositional analysis of the selected areas are analyzed using SEM and EDAX. The maximum relative density 87.5% and the grain size 44.6 μm are observed in this ceramics combination.


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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1063/1.3377883
Publisher: American Institute of Physics
Keywords: Photopyroelectric spectroscopy; Varistor; ZnO
Depositing User: Nabilah Mustapa
Date Deposited: 26 Sep 2017 04:10
Last Modified: 26 Sep 2017 04:10
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1063/1.3377883
URI: http://psasir.upm.edu.my/id/eprint/57346
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