Jump to main content
Jump to site search

Issue 20, 2012
Previous Article Next Article

High-temperature ferromagnetism in Co-doped CeO2 synthesized by the coprecipitation technique

Author affiliations

Abstract

The aim of the present study is to check the influence of annealing under vacuum and a mixture of N2–H2 atmosphere on the magnetic properties of polycrystalline Co-doped CeO2 diluted magnetic oxides (DMOs) with Co concentrations of 5 at% synthesized using the coprecipitation technique. X-Ray diffraction (XRD) patterns and transmission electron microscopy (TEM) showed for all samples the expected CeO2 cubic fluorite-type structure and that Co ions are uniformly distributed inside the samples. Room-temperature Raman and photoluminescence (PL) spectroscopies indicate an increase in the concentration of oxygen vacancies upon Co doping and further annealing. Field dependent magnetization measurements revealed a paramagnetic behavior for as-prepared Co-doped CeO2, while a ferromagnetic behavior appears when the same samples are annealed under vacuum or N2–H2 atmosphere. Temperature dependent magnetization measurements suggest that the observed ferromagnetism is due to the presence of metallic Co clusters with nanometric size and broad size distribution. These results are supported by electron paramagnetic resonance studies.

Graphical abstract: High-temperature ferromagnetism in Co-doped CeO2 synthesized by the coprecipitation technique

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 12 Dec 2011, accepted on 28 Mar 2012 and first published on 18 Apr 2012


Article type: Paper
DOI: 10.1039/C2CP23973F
Citation: Phys. Chem. Chem. Phys., 2012,14, 7256-7263
  •   Request permissions

    High-temperature ferromagnetism in Co-doped CeO2 synthesized by the coprecipitation technique

    S. Colis, A. Bouaine, G. Schmerber, C. Ulhaq-Bouillet, A. Dinia, S. Choua and P. Turek, Phys. Chem. Chem. Phys., 2012, 14, 7256
    DOI: 10.1039/C2CP23973F

Search articles by author