Loading...

Structural, magnetic, and optical properties of zinc-and copper-substituted nickel ferrite nanocrystals

Tehrani, F. S ; Sharif University of Technology | 2012

1042 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s10948-012-1655-5
  3. Publisher: Springer , 2012
  4. Abstract:
  5. Ferrite nanocrystals are an interesting material due to their rich physical properties. Here we add nonmagnetic dopants Zn and Cu to nickel ferrite nanocrystals, Ni1-xMxFe2O4 (0 ≤ x ≤ 1, M = Cu, Zn), and study how relevant properties of the samples are modified accordingly. Basically, these dopings cause a rearrangement of Fe +3 ions into the two preexisting octahedral and tetrahedral sites. In fact, this, we show, induces pertinent magnetic properties of the doped samples. In the case of the Cu-doping, the Jahn-Teller effect also emerges, which we identify through the Fourier Transform Infra-Red Spectroscopy of the samples. Moreover, we show an increase in the lattice parameters of the doped samples, as well a superparamagnetic behavior for the doped samples is shown, while the Jahn-Teller effect precludes a similar behavior in the CuFe 2O4 nanocrystals. The influences of Zn and Cu substitutions are investigated on the optical properties of nickel ferrite nanocrystals by photoluminescence measurement at room temperature
  6. Keywords:
  7. Nanocrystalline magnetic materials ; Superparamagnetic ; Cu-doping ; Doped sample ; Ferrite nanocrystals ; Nanocrystalline magnetic material ; Nickel ferrite ; Nonmagnetic dopants ; Photoluminescence measurements ; Room temperature ; Sol-Gel processing ; Superparamagnetic behavior ; Superparamagnetics ; Tetrahedral sites ; Doping (additives) ; Ferrite ; Ferrites ; Gyrators ; Jahn-Teller effect ; Magnetic anisotropy ; Magnetic materials ; Magnetic properties ; Optical properties ; Sol-gel process ; Superparamagnetism ; Zinc ; Nanocrystals
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 25, Issue 7 , 2012 , Pages 2443-2455 ; 15571939 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10948-012-1655-5