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Concentration dependence of magnetic moment in Ce1-xFexO2
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) XRD patterns for pure ceria samples. Through the Scherrer relation, the average size of the particles was determined to be about 4 nm for all three samples. (b)-(c) TEM image and diffraction pattern with size distribution.

Image of FIG. 2.
FIG. 2.

(a)-(c) show the change in lattice parameters for Fe-doped samples of Ce-Cl, Ce-Nit, and Ce-AmNit methods, respectively, with a linear fit applied. All three methods showed a strong “dip” in the lattice parameter for x < 2.5%, indicated by a drop line at 2.5%. For Ce-Cl–prepared samples, there was a more stable linear decline in the lattice parameter. This trend also appears to be present in the other two methods.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Fe 3p peak positions from XPS analysis of Fe-doped Ce-AmNit samples. The three drop lines indicate the reported Fe 3p peak positions of Fe3+ in Fe2O3 and two Fe2+ positions reported for FeO at 55.4, 54.9, and 54.5 eV, respectively (Ref. 14). (b) Fe 3p peaks for iron-doped Ce-Cl samples with drop lines corresponding to the ones mentioned in (b). Peak positions for Fe2O3 and FeOOH established from Ref. 14 and curve fits from Refs. 2 and 3.

Image of FIG. 4.
FIG. 4.

(Color online) (a) XPS Ce3d spectral region for three 1% Fe-doped samples. (b) EPR spectra for 1% and 5% Fe-doped Ce-Cl samples recorded at T ∼ 5 K.

Image of FIG. 5.
FIG. 5.

(Color online) (a)-(b) Magnetization and moment of Ce-Cl samples. (c)-(d) Magnetization and moment of Ce-Nit and Ce-AmNit samples.

Image of FIG. 6.
FIG. 6.

Average saturation magnetization Ms of Fe-doped ceria samples prepared using the three methods vs the Ce3+/4+ ratios along with a linear fit shown for the three points. Ce3+/4+ ratios were determined from XPS analysis (Ref. 15).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Concentration dependence of magnetic moment in Ce1-xFexO2