X-ray absorption spectroscopic and magnetic characterization of cobalt-doped zinc oxide nanocrystals prepared by the molten-salt method
- Authors
- Han, AR[Han, Ah Reum]; Hwang, SJ[Hwang, Seong-Ju]; Zhao, Y[Zhao, Yongnan]; Kwon, YU[Kwon, Young-Uk]
- Issue Date
- Apr-2008
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- cobalt-doped zinc oxide; local atomic arrangement; ferromagnetism; Wurzite structure; tetrahedral symmetry
- Citation
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.320, no.8, pp.1591 - 1596
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
- Volume
- 320
- Number
- 8
- Start Page
- 1591
- End Page
- 1596
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/81695
- DOI
- 10.1016/j.jmmm.2008.01.011
- ISSN
- 0304-8853
- 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 angstrom, 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 2K. 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. (c) 2008 Elsevier B.V. All rights reserved.
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