Abstract
Undoped CeO2 nanoparticles and CeO2 nanoparticles doped with 20% Fe3+, Co2+ or Mn2+ synthesized using a co-precipitation method and calcined at 600 °C were studied. All synthesized samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption near edge spectroscopy (XANES), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometry (VSM). The XRD spectra exhibited peaks corresponding to a single phase face-centered cubic CeO2 in all samples. Crystallite sizes decreased to 10.5 ± 0.3 nm for the Mn2+ dopant compared to that of undoped CeO2 for 15.0 ± 0.8 nm. The presence of Ce3+, Ce4+, Fe3+, Co2+, Mn2+ ions and oxygen vacancies in all samples containing CeO2 was determined from the XANES and XPS spectra. Magnetic results obtained from undoped CeO2 exhibited ferromagnetic (FM) behavior at room temperature (RT) with a magnetization (M) of 0.005 emu/g that can be explained in terms of Ce3+ and an oxygen vacancy mediated F-center exchange (FCE) mechanism. Doped CeO2 samples exhibited higher M values compared to that of undoped CeO2, especially in Fe3+-doped CeO2 samples, which showed the highest M value, 0.09 emu/g. The roles of Ce3+ and their spin electrons are discussed. The novelty of this work is the formation of a single phase CeO2 nanoparticles with high doping concentration of 20% and all shows ferromagnetism above RT. As a result, this research may open up new avenues for the design of advanced spintronic devices.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
