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Titolo:
Structural characterization of partially amorphous SnO2 nanoparticles by factor analysis of XAS and FT-IR spectra
Autore:
Jimenez, VM; Caballero, A; Fernandez, A; Espinos, JP; Ocana, M; Gonzalez-Elipe, AR;
Indirizzi:
Univ Sevilla, CSIC, Inst Ciencia Mat, Seville 41092, Spain Univ Sevilla Seville Spain 41092 Inst Ciencia Mat, Seville 41092, Spain Dept Quim Inorgan, Seville 41092, Spain Dept Quim Inorgan Seville Spain 41092 Quim Inorgan, Seville 41092, Spain
Titolo Testata:
SOLID STATE IONICS
fascicolo: 1-2, volume: 116, anno: 1999,
pagine: 117 - 127
SICI:
0167-2738(199901)116:1-2<117:SCOPAS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEPTH; OXIDE; TIO2;
Keywords:
factor analysis; SnO2; X-ray absorption spectroscopy; FT-IR; structural characterization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez-Elipe, AR Univ,Sevilla, CSIC, Inst Ciencia Mat, Avda Amer Vespucio S-N, Seville 41092 Univ Sevilla Avda Amer Vespucio S-N Seville Spain 41092
Citazione:
V.M. Jimenez et al., "Structural characterization of partially amorphous SnO2 nanoparticles by factor analysis of XAS and FT-IR spectra", SOL ST ION, 116(1-2), 1999, pp. 117-127

Abstract

This paper reports a new approach for the structural and morphological characterization of powders. It has been applied to characterize a nanostructured SnO2 material prepared by the gas phase condensation method. Transmission electron microscopy, X-ray diffraction, X-ray absorption spectroscopy and infrared spectroscopy have been used for the characterization of the samples. Besides the conventional fitting procedure of the EXAFS spectra, the mathematical method of factor analysis applied to the XANES spectra has beenused to determine the percentage of amorphous phase existing in the samples after annealing at increasing temperatures up to 773 K. The results are confirmed by a FEFF simulation of the EXAFS spectra. The original powder waspartially amorphous and was formed by very fine particles (d similar to 8-10 nm) linked in a fractal-like structure. No significant sintering occurs at T = 573 K, although the powder becomes more crystalline. At 773 K, sintering (d similar to 20-30 nm) and further crystallization takes place. Factor analysis has been also applied for the study of the FT-IR spectra of SnO2nanoparticles and the results confirm semiquantitatively the degree of crystallization calculated from the analysis of the XANES spectra. The effective medium theory permits a description of the particle shapes that constitutes the crystalline component of the FT-LR spectra determined by factor analysis. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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Documento generato il 28/11/20 alle ore 21:32:49