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XANES and EXAFS study of the local order in nanocrystalline yttria-stabilized zirconia

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Durá, O. J. y Boada, R. y López de la Torre, M.A. y Aquilanti, G. y Rivera Calzada, Alberto Carlos y León Yebra, Carlos y Chaboy, J. (2013) XANES and EXAFS study of the local order in nanocrystalline yttria-stabilized zirconia. Physical Review B, 87 . ISSN 1098-0121

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URL Oficial: http://prb.aps.org/abstract/PRB/v87/i17/e174109



Resumen

The local order around Zr and Y atoms of nanocrystalline yttria-stabilized zirconia (YSZ) powders with
different grain sizes has been investigated by x-ray absorption spectroscopies. The samples were prepared by
means of mechanical alloying with or without subsequent sintering treatment and also by milling commercial
YSZ. Our study is motivated by the interest in the electrical properties of grain boundaries and the controversy about the level of disorder in the intergrain regions in nanocrystalline YSZ. The x-ray absorption near edge
structure (XANES) analysis indicates that the local order of all the sintered samples is independent of the grain
size. This is confirmed by the analysis of the extended x-ray absorption fine structure, which points out also that,
in contrast to that found in sintered samples, the local order around the cation in the samples milled without
further sintering treatment extends only to the first coordination shell. Finally, the results of ab initio Zr K-edge XANES calculations lead us to conclude that the observed changes of the shape of the white line are not related to a phase transformation but reflects the short-range order present in the as-milled samples.


Tipo de documento:Artículo
Palabras clave:Nanocrystalline
Materias:Ciencias > Física > Física del estado sólido
Código ID:22161
Depositado:12 Jul 2013 11:22
Última Modificación:12 Jul 2013 11:22

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