Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 5, 2015
Previous Article Next Article

The role of oxygen vacancies and their location in the magnetic properties of Ce1−xCuxO2−δ nanorods

Author affiliations

Abstract

Ceria (CeO2) is a promising dilute magnetic semiconductor. Several studies report that the intrinsic and extrinsic structural defects are responsible for room temperature ferromagnetism in undoped and transition metal doped CeO2 nanostructures; however, the nature of the kind of defect necessary to promote and stabilize the ferromagnetism in such a system is still a matter of debate. In the work presented here, nanorods from the system Ce1−xCuxO2−δ with x = 0, 0.01, 0.03, 0.05 and 0.10, with the more stable {111} surface exposed were synthesized by a microwave-assisted hydrothermal method. A very careful structure characterization confirms that the Cu in the samples assumes a majority 2+ oxidation state, occupying the Ce (Ce4+ and Ce3+) sites with no secondary phases up to x = 0.05. The inclusion of the Cu2+ in the CeO2 structure leads to the introduction of oxygen vacancies in a density proportional to the Cu2+ content. It is supposed that the spatial distribution of the oxygen vacancies follows the Cu2+ distribution by means of the formation of a defect complex consisting of Cu2+ ion and an oxygen vacancy. Superconducting quantum interference device magnetometry demonstrated a diamagnetic behavior for the undoped sample and a typical paramagnetic Curie–Weiss behavior with antiferromagnetic interactions between the Cu2+ ions for the single phase doped samples. We suggest that the presence of oxygen vacancies is not a sufficient condition to mediate ferromagnetism in the CeO2 system, and only oxygen vacancies in the surface of nanostructures would lead to such a long range magnetic order.

Graphical abstract: The role of oxygen vacancies and their location in the magnetic properties of Ce1−xCuxO2−δ nanorods

Back to tab navigation

Publication details

The article was received on 25 Oct 2014, accepted on 01 Dec 2014 and first published on 02 Dec 2014


Article type: Paper
DOI: 10.1039/C4CP04879B
Author version
available:
Download author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 3072-3080

  •   Request permissions

    The role of oxygen vacancies and their location in the magnetic properties of Ce1−xCuxO2−δ nanorods

    M. I. B. Bernardi, A. Mesquita, F. Béron, K. R. Pirota, A. O. de Zevallos, A. C. Doriguetto and H. B. de Carvalho, Phys. Chem. Chem. Phys., 2015, 17, 3072
    DOI: 10.1039/C4CP04879B

Search articles by author

Spotlight

Advertisements