Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653253 | Solid State Communications | 2005 | 5 Pages |
Abstract
The electronic structure of polycrystalline ferromagnetic Zn1âxCoxO (0.05â¤xâ¤0.15) and the oxidation state of Co in it, have been investigated. The Co-doped polycrystalline samples are synthesized by a combustion method and are ferromagnetic at room temperature. XPS and optical absorption studies show evidence for Co2+ ions in the tetrahedral symmetry, indicating substitution of Co2+ in the ZnO lattice. However, powder XRD and electron diffraction data show the presence of Co metal in the samples. This give evidence to the fact that some Co2+ ion are incorporated in the ZnO lattice which gives changes in the electronic structure whereas ferromagnetism comes from the Co metal impurities present in the samples.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Sasanka Deka, P.A. Joy,