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An X-ray absorption spectroscopy study of the inversion degree in zinc ferrite nanocrystals dispersed on a highly porous silica aerogel matrix
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10.1063/1.4789479
/content/aip/journal/jcp/138/5/10.1063/1.4789479
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/5/10.1063/1.4789479

Figures

Image of FIG. 1.
FIG. 1.

Wide angle XRD patterns of: (a) ZF_750_1; (b) ZF_750_6; (c) ZF_900_1; and (d) ZF_B.

Image of FIG. 2.
FIG. 2.

(a) N2 physisorption isotherms at 77 K of ZF_900_1, and corresponding BJH pore size distribution as derived from the desorption branch (inset), and (b) TEM bright field image of ZF_900_1.

Image of FIG. 3.
FIG. 3.

XANES spectra from experiment at the Fe K-edge (left) and Zn K-edge (right): (a) ZF_750_1; (b) ZF_750_6; (c) ZF_900_1; and (d) ZF_B. (Inset) Pre-peak of ZF_750_1, ZF_750_6, ZF_900_1, ZF_B are shown from top to bottom.

Image of FIG. 4.
FIG. 4.

k 3χ(k) at the Fe K-edge (left) and Zn K-edge (right) from experiment (−) and fit results (···): (a) ZF_750_1; (b) ZF_750_6; (c) ZF_900_1; and (d) ZF_B.

Image of FIG. 5.
FIG. 5.

Fourier transforms of k 3χ(k) spectra at the Fe K-edge (left) and Zn K-edge (right) from experiment (−) and fit results (···): (a) ZF_750_1; (b) ZF_750_6; (c) ZF_900_1; and (d) ZF_B.

Tables

Generic image for table
Table I.

Interatomic distances (R), Debye-Waller factors (σ) and fraction of cations in sites A (xA) and B (xB) obtained by fitting the experimental EXAFS of ZF_900_1. Values of EF, R-factor, and *R-factor are also reported. Coordination numbers (N) were kept fixed.

Generic image for table
Table II.

Interatomic distances (R), Debye-Waller factors (σ) and fraction of cations in sites A (xA) and B (xB) obtained by fitting the experimental EXAFS of ZF_750_6. Values of EF, R-factor, and *R-factor are also reported. Coordination numbers (N) were kept fixed.

Generic image for table
Table III.

Interatomic distances (R), Debye-Waller factors (σ) and fraction of cations in sites A (xA) and B (xB) obtained by fitting the experimental EXAFS of ZF_750_1. Values of EF, R-factor, and *R-factor are also reported. Coordination numbers (N) were kept fixed.

Generic image for table
Table IV.

Interatomic distances (R) and Debye-Waller factors (σ) obtained by fitting the experimental EXAFS of ZF_B. Values of EF, R-factor, and *R-factor are also reported. Coordination numbers (N) were kept fixed.

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/content/aip/journal/jcp/138/5/10.1063/1.4789479
2013-02-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An X-ray absorption spectroscopy study of the inversion degree in zinc ferrite nanocrystals dispersed on a highly porous silica aerogel matrix
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/5/10.1063/1.4789479
10.1063/1.4789479
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