Room temperature ferromagnetism in Ni, Fe and Ag co-doped Cu–ZnO nanoparticles: an experimental and first-principles DFT study
| Autor: | Yinglin Song, Marzook S. Alshammari, M. Bououdina, Ali Z. Alanzi, O.M. Lemine, J. H. Dai, R. Alhathlool, A. Modwi, Ammar Houas |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Ionic radius Materials science Doping Analytical chemistry Nanoparticle 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Paramagnetism Ferromagnetism Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Crystallite Electrical and Electronic Engineering 0210 nano-technology Wurtzite crystal structure |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:14387-14395 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-018-9571-5 |
| Popis: | We report an experimental and theoretical investigation on the room temperature ferromagnetism of Zn0.95Cu0.05O and Zn0.94Cu0.05M0.01O (M=Ni, Fe and Ag)Ni nanoparticles synthesized by sol–gel method. X-ray diffraction analysis reveals single hexagonal wurtzite; meanwhile the lattice parameters are found to be sensitive to the ionic radius of the doping elements and the crystallite size varies in the range 22–47 nm. Field emission scanning electron microscopy observations show particles with spherical shape for ZnO and semi-spherical shape for co-doped nanopowders. Magnetic measurements using SQUID reveal room temperature ferromagnetic ordering for doped and co-doped nanopowders with a lower saturation magnetization compared to Cu-doped ZnO. It is found that the co-doping has resulted in weakening the ferromagnetic phase at the expense of the paramagnetic. First-principles calculations indicate that only Cu and Fe codoped ZnO systems own ferromagnetism, which originated from the interaction between Fe-d and O-p electrons. However, all doped systems show positive formation energies indicating they are less stable than undoped ZnO. |
| Databáze: | OpenAIRE |
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