We report the results of XANES and EXAFS measurements performed on YBa2Cu3O7–x compounds withx ranging from 0 to 1. Data for Cu and YK-edges are presented and definite trends in the behaviour of the main near edge structures are singled out, which allow to address the question of the Cu and Y oxidation states and to elucidate the role of the chemical environment in determining the shape of the absorption lines. The inter-atomic distances as obtained by EXAFS generally agree with the results of X-ray diffraction data with the exception of the Y–O distances. Possible sources of this discrepancy are indicated.
X-ray Absorption Spectroscopy in YBa2Cu3O7-x superconductors with variable oxygen con¬tent / M., Sacchi; Corni, Federico; G. M., Antonini; CALANDRA BUONAURA, Carlo; F. C., Matacotta; R., Frahm. - In: ZEITSCHRIFT FÜR PHYSIK. B, CONDENSED MATTER. - ISSN 0722-3277. - STAMPA. - 72:(1988), pp. 335-343. [10.1007/BF01312819]
X-ray Absorption Spectroscopy in YBa2Cu3O7-x superconductors with variable oxygen con¬tent
CORNI, Federico;CALANDRA BUONAURA, Carlo;
1988
Abstract
We report the results of XANES and EXAFS measurements performed on YBa2Cu3O7–x compounds withx ranging from 0 to 1. Data for Cu and YK-edges are presented and definite trends in the behaviour of the main near edge structures are singled out, which allow to address the question of the Cu and Y oxidation states and to elucidate the role of the chemical environment in determining the shape of the absorption lines. The inter-atomic distances as obtained by EXAFS generally agree with the results of X-ray diffraction data with the exception of the Y–O distances. Possible sources of this discrepancy are indicated.
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