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Room-temperature ferromagnetism in Co-doped CeO2 nanospheres prepared by the polyvinylpyrrolidone-assisted hydrothermal method
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10.1063/1.4766273
/content/aip/journal/jap/112/11/10.1063/1.4766273
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/11/10.1063/1.4766273

Figures

Image of FIG. 1.
FIG. 1.

XRD patterns of pure CeO2 and Co-doped CeO2 nanospheres (a) prepared at 160 °C for 12 h and (b) 200 °C for 12 h.

Image of FIG. 2.
FIG. 2.

(a) High-magnification TEM images (HRTEM) of Co-doped CeO2 nanospheres for x = 0.01 prepared at 200 °C for 12 h (inset shows FE-SEM images of Co-doped CeO2 nanospheres for x = 0.07 at 160 °C for 12 h). TEM bright field images with corresponding SAED patterns of Co-doped CeO2 nanospheres prepared at 200 °C for 12 h. for (b) x = 0.01, (c) x = 0.03, (d) x = 0.05, and (e) x = 0.07.

Image of FIG. 3.
FIG. 3.

Room-temperature optical absorbance spectra of pure CeO2 and Co-doped CeO2 nanospheres (a) prepared at 160 °C for 12 h and (b) 200 °C for 12 h. (c) Plot of (αhv)2 as a function of photon energy for Co-doped CeO2 nanospheres prepared at 200 °C for 12 h.

Image of FIG. 4.
FIG. 4.

(a) XANES spectra at the Ce L3 absorption edge for CeCl3, CeO2 standard and XANES spectra of samples prepared at 200 °C for 12 h. (b)XANES spectra at the Co K absorption edge for Co3O4, CoO standard and XANES spectra of samples prepared at 200 °C for 12 h.

Image of FIG. 5.
FIG. 5.

Gaussian fits of XANES spectra of Ce for samples prepared at 200 °C for 12 h with x = 0, 0.03, and 0.07.

Image of FIG. 6.
FIG. 6.

Magnetic properties of pure CeO2 and Co-doped CeO2 nanospheres (a) prepared at 160 °C for 12 h (inset shows magnetic loop of Co-doped CeO2 samples for x = 0.01) and (b) prepared at 200 °C for 12 h.

Image of FIG. 7.
FIG. 7.

Schemes of the configurations of oxygen vacancies within the CeO2 for: (a) One vacancy per Co atom. (b) Two vacancies per Co. (c) and (d)The magnetic coupling between Co and Ce3+ ions of FM and AFM, respectively. The white square indicates an oxygen vacancy.

Tables

Generic image for table
Table I.

Summary of crystallite sizes from XRD, Lattice constant, band gap energy and Magnetization (M) of pure CeO2 and Co-doped CeO2 nanospheres prepared at 200 °C for 12 h.

Generic image for table
Table II.

The Gaussian fits of XANES spectra for Ce of pure CeO2 and Co-doped CeO2 nanospheres prepared at 200 °C for 12 h.

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/content/aip/journal/jap/112/11/10.1063/1.4766273
2012-12-05
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Room-temperature ferromagnetism in Co-doped CeO2 nanospheres prepared by the polyvinylpyrrolidone-assisted hydrothermal method
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/11/10.1063/1.4766273
10.1063/1.4766273
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