Variation of structural and magnetic properties with Co-doping in Zn1−xCoxO nanocrystals

The Zn1−xCoxO (x=0–0.20) nanocrystals synthesized via sol-gel method have been systematically investigated by using x-ray diffraction, transmission electronic microscopy (TEM), Raman spectrometer (Raman), UV-vis spectrometer (UV-vis), and vibrating sample magnetometer. It is found that the crystal l...

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Bibliographic Details
Published in:Journal of applied physics 2009-03, Vol.105 (5)
Main Authors: Li, Jian-jun, Hao, Wei-chang, Xu, Huai-zhe, Wang, Tian-min
Format: Article
Language:English
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Summary:The Zn1−xCoxO (x=0–0.20) nanocrystals synthesized via sol-gel method have been systematically investigated by using x-ray diffraction, transmission electronic microscopy (TEM), Raman spectrometer (Raman), UV-vis spectrometer (UV-vis), and vibrating sample magnetometer. It is found that the crystal lattice constant (a) and the cell volume of Zn1−xCoxO are irrespective of the Co composition x when x0.05 is attributed to the formation of the Co3O4 phase in Zn1−xCoxO due to the self-purification mechanism in nanocrystals growth process. The formation of the antiferromagnetic Co3O4 well explains the decrease in Zn1−xCoxO ferromagnetism with the increase in Co-doping when x>0.05.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3087493