Synthesis, structural and magnetic properties of CeO2 nanoparticles

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Synthesis, structural and magnetic properties of CeO2 nanoparticles

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CeO2 nanoparticles were prepared by a simple co-precipitation method and the structural and magnetic properties were studied. X-ray diffraction, Raman and selected area electron diffraction results indicate that the samples have the cubic fluorite structure without other impurity phases. Magnetisation measurements indicate that the CeO2 nanoparticles calcined at different temperatures exhibit room temperature ferromagnetism (RTFM). The result of energy-dispersed X-ray spectrometry (EDS) analysis indicates that ferromagnetic impurities could not be responsible for the magnetic signals and that ferromagnetism (FM) is an inherent property of the material. It is found that the saturation magnetisation (Ms) of CeO2 nanoparticles increases after annealing in reducing ambience and decreases after annealing in a rich-oxygen atmosphere, which confirms that the oxygen vacancies may play an important role in introducing FM.

Inspec keywords: nanofabrication; X-ray chemical analysis; annealing; calcination; precipitation; ferromagnetic materials; nanoparticles; magnetisation; cerium compounds; electron diffraction; Raman spectra; X-ray diffraction

Other keywords: calcination; Raman diffraction; X-ray diffraction; selected area electron diffraction; saturation magnetisation; coprecipitation; temperature 293 K to 298 K; room temperature ferromagnetism; CeO2; nanoparticles; structural properties; annealing; cubic fluorite structure; magnetic properties; energy-dispersed X-ray spectrometry; magnetic signals

Subjects: Precipitation and segregation; Magnetization curves, hysteresis, Barkhausen and related effects; Electromagnetic radiation spectrometry (chemical analysis); Low-dimensional structures: growth, structure and nonelectronic properties; Amorphous and nanostructured magnetic materials; Cold working, work hardening; post-deformation annealing, recovery and recrystallisation; textures; Ferromagnetism of nonmetals; Methods of nanofabrication and processing; Magnetic properties of nanostructures

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