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Photopyroelectric spectrum of MNO2 Doped Bi2O3 - TiO2 - ZnO ceramic combination


Rizwan, Zahid and Zakaria, Azmi and Mat Yunus, Wan Mahmood and Hashim, Mansor and Shaari, Abdul Halim (2008) Photopyroelectric spectrum of MNO2 Doped Bi2O3 - TiO2 - ZnO ceramic combination. Pertanika Journal of Science & Technology, 16 (2). pp. 275-280. ISSN 0128-7680; ESSN: 2231-8526


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)2 vs 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 MnO2. 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.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Universiti Putra Malaysia Press
Keywords: Photopyroelectric; Band gap; Zinc oxide
Depositing User: Noor Syafini Zamani
Date Deposited: 20 Nov 2015 01:01
Last Modified: 20 Nov 2015 01:01
URI: http://psasir.upm.edu.my/id/eprint/40530
Statistic Details: View Download Statistic

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