Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure

The nonequilibrium cation site occupancy in nanosized zinc ferrites ( ∼ 6 – 13 nm ) with different degree of inversion ( ∼ 0.2 to 0.4) was investigated using Fe and Zn K -edge x-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure, and magnetic measurements. The...

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Detalles Bibliográficos
Autores principales: Stewart, Silvana Jacqueline, Figueroa, S. J. A., Ramallo López, José Martín, Marchetti, Sergio Gustavo, Bengoa, José Fernando, Prado, R. J., Requejo, Félix Gregorio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Física
Xanes
Absorption spectroscopy
Nanocrystalline material
X-ray spectroscopy
Ab initio quantum chemistry methods
Materials science
Spinel
Spectroscopy
Spectral line
Crystallography
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126026
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126026
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Xanes
Absorption spectroscopy
Nanocrystalline material
X-ray spectroscopy
Ab initio quantum chemistry methods
Materials science
Spinel
Spectroscopy
Spectral line
Crystallography
spellingShingle Física
Xanes
Absorption spectroscopy
Nanocrystalline material
X-ray spectroscopy
Ab initio quantum chemistry methods
Materials science
Spinel
Spectroscopy
Spectral line
Crystallography
Stewart, Silvana Jacqueline
Figueroa, S. J. A.
Ramallo López, José Martín
Marchetti, Sergio Gustavo
Bengoa, José Fernando
Prado, R. J.
Requejo, Félix Gregorio
Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
topic_facet Física
Xanes
Absorption spectroscopy
Nanocrystalline material
X-ray spectroscopy
Ab initio quantum chemistry methods
Materials science
Spinel
Spectroscopy
Spectral line
Crystallography
description The nonequilibrium cation site occupancy in nanosized zinc ferrites ( ∼ 6 – 13 nm ) with different degree of inversion ( ∼ 0.2 to 0.4) was investigated using Fe and Zn K -edge x-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure, and magnetic measurements. The very good agreement between experimental and ab initio calculations on the Zn K -edge XANES region clearly shows the large Zn²⁺ ( A ) → Zn²⁺ [ B ] transference that takes place in addition to the well-identified Fe³⁺ [ B ] → Fe³⁺ ( A ) one, without altering the long-range structural order. XANES spectra features as a function of the spinel inversion were shown to depend on the configuration of the ligand shells surrounding the absorbing atom. This XANES approach provides a direct way to sense cationic inversion in these Zn-containing spinel ferrites. We also demonstrated that a mechanical crystallization takes place on nanocrystalline spinel that causes an increase of both grain and magnetic sizes and, simultaneously, generates a significant augment of the inversion.
format Articulo
Articulo
author Stewart, Silvana Jacqueline
Figueroa, S. J. A.
Ramallo López, José Martín
Marchetti, Sergio Gustavo
Bengoa, José Fernando
Prado, R. J.
Requejo, Félix Gregorio
author_facet Stewart, Silvana Jacqueline
Figueroa, S. J. A.
Ramallo López, José Martín
Marchetti, Sergio Gustavo
Bengoa, José Fernando
Prado, R. J.
Requejo, Félix Gregorio
author_sort Stewart, Silvana Jacqueline
title Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
title_short Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
title_full Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
title_fullStr Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
title_full_unstemmed Cationic exchange in nanosized ZnFe₂O₄ spinel revealed by experimental and simulated near-edge absorption structure
title_sort cationic exchange in nanosized znfe₂o₄ spinel revealed by experimental and simulated near-edge absorption structure
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/126026
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bdutipo_str Repositorios
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