Structural and optical properties of Zn0.8Co0.2O ceramics
Conference proceedings article
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Publication Details
Author list: Sujinnapram S., Onreabroy W., Nantawisarakul T.
Publisher: Trans Tech Publications
Publication year: 2008
Volume number: 55-57
Start page: 337
End page: 340
Number of pages: 4
ISBN: 9780878493562
ISSN: 1022-6680
Languages: English-Great Britain (EN-GB)
Abstract
The Zn0.8Co0.2O ceramics were synthesized by the solid state reaction method with the mixture of ZnO and CoO powders. The mixed powders were sintered at 1200 ฐC and 1300 ฐC for 4 hours. It was found that the X-ray diffraction patterns of Zn0.8Co0.2O ceramics were similar to that of the pure ZnO one. The crystal structure of Zn0.8Co0.8O ceramics were then determined using the Rietveld full-profile analysis method to indicate a single phase with a wurtzite-like structure. Their microstructures were examined using the scanning electron microscopy. The results showed that their grain sizes were increased with increasing both the sintering temperatures and the doping effect. Moreover, the optical absorption spectra using UV-Vis spectrometer showed that there were several extra absorption bands appearing in the Zn0.8Co 0.2O samples. This confirms that Co2+ is substituted Zn2+ in the wurtzite structure. ฉ 2008 Trans Tech Publications, Switzerland.
Keywords
Crystal structure, Rietveld analysis, Zn1-xCoxO ceramics
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