Author(s):
1. Zoran Popović, University of Belgrade, Faculty of Physics, Serbia

Abstract:
We have measured the magnetization of undoped and Fe2+/3+ doped CeO2-y nanocrystals at various temperatures and magnetic fields. In the case of Fe-doped samples, the superparamagnetic behaviour of this system is revealed by nearly zero coercive field, an appearance of the blocking temperature below 20 K, as well as the M(H) dependence, which is well fitted by weighted Langevin function which takes into account particle magnetic moment distribution. We have also measured Raman scattering spectra of these nonocrystalline samples. Raman mode exhibits softening and broadening by changing the valence state of Fe dopant, as a consequence of the electron-molecular vibration coupling.

Key words:
superparamagnetism, nano ceria, magnetization, Raman scattering, electron-phonon coupling

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
27.06.2018.

Conference:
Contemporary Materials 2018 - Savremeni Materijali

Abstract