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X-ray absorption spectroscopic and magnetic characterization of cobalt-doped zinc oxide nanocrystals prepared by the molten-salt method

Title
X-ray absorption spectroscopic and magnetic characterization of cobalt-doped zinc oxide nanocrystals prepared by the molten-salt method
Authors
Han A.R.Hwang S.-J.Zhao Y.Kwon Y.-U.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2008
Journal Title
Journal of Magnetism and Magnetic Materials
ISSN
0304-8853JCR Link
Citation
vol. 320, no. 8, pp. 1591 - 1596
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The local atomic arrangement and electronic structure of the Co-doped Zn1-xCoxO nanocrystal have been quantitatively examined along with its magnetic properties. According to our analysis using powder X-ray diffraction, electron microscopy, and Zn K-edge X-ray absorption spectroscopy (XAS), phase-pure wurzite-structured Zn1-xCoxO nanocrystals have been successfully synthesized via the molten-salt method. The Co K-edge XAS analysis clearly demonstrates that all the Co2+ ions are substituted for the tetrahedral Zn sites of the Wurzite structure with a coordination number of 3.9 and a bond distance of 1.97 Å, ruling out the presence of magnetic impurity phase and Co-metal cluster. Magnetization measurements reveal that the present Zn1-xCoxO sample does not show any ferromagnetic transition down to 2 K. In this regard, we can conclude that Co-doped zinc oxide is not ferromagnetic but the previously reported ferromagnetism in this phase would be an extrinsic property. © 2008 Elsevier B.V. All rights reserved.
DOI
10.1016/j.jmmm.2008.01.011
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자연과학대학 > 화학·나노과학전공 > Journal papers
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