Study of the L3 edges of ion-beam-mixed PdCu alloys by X-ray absorption spectroscopy

Lee, Y. S.; Whang, C. N.; Jeon, Young Hoon; Choi, Bum Sik; Han, Tae Jong; Woo, Juhyung; Croft, Mark

doi:10.1016/s0168-583x(97)00142-0

Cited by 7 publications

(6 citation statements)

References 27 publications

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“…Thus the charges are transferred from lithium to the Pd d-band and contribute to the filling of the empty d-states of Pd. The decrease in the intensity of white line in Pd L 3 -edge XAFS spectra were also observed in Pd-Ag alloys and Pd-Cu alloys [10][11][12][13]. Similarly, we can conclude that Pd ''d-band'' is being filled upon alloying with lithium.…”

Section: Chemical States At the Pd-li Interfacesupporting

confidence: 67%

In-situ vacuum deposition technique of lithium on neutron production target for BNCT

Ishiyama

Baba

Fujii³

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Chemical States At the Pd-li Interfacesupporting

confidence: 67%

In-situ vacuum deposition technique of lithium on neutron production target for BNCT

Ishiyama

Baba

Fujii³

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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“…The WL feature is associated with a dipole allowed transition from a 2p 3/2 core level into an empty 6d state, lying just above the continuum. Changes in the intensity of the WL can result from variations in the occupancy of d states caused by charge transfer between the central absorbing atom and its surrounding nearest neighbors, an extrinsic effect (e.g., refs and ). Intrinsic particle size effects leading to variations in L3 XANES WL intensities have been reported for, e.g., spectra of metallic nanoparticles (e.g., ref ).…”

Section: Discussionmentioning

confidence: 99%

XAFS and LIBD Investigation of the Formation and Structure of Colloidal Pu(IV) Hydrolysis Products

et al. 2004

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Pu(IV) oxyhydroxide colloid growth is investigated with XAFS and LIBD. From combined results a model of colloid formation is proposed, which leads to a face-centered cubic Pu sublattice having cation defects, as observed with EXAFS, and a linear dependency of log [Pu(IV)] on -log [H+] with slope -2, in accord with LIBD. The solubility for Pu(IV) measured with LIBD is close to the lower limit of the solubility curve from previously reported data.

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“…In the one-electron approximation, perturbation of the core hole on the d charge density is negligible . Change in the intensity of the WL can result from variations in the occupancy of d states caused by a charge transfer between the central absorbing atom and its surrounding nearest neighbors, an extrinsic effect This is the basis of a method that has been used for estimating the amount of unoccupied d states from a relative change in WL areas (e.g., in refs and ). An example of an intrinsic, particle size effect leading to variation in L3 XANES WL intensity has been reported for spectra of Pt nanoparticles .…”

Section: Discussionmentioning

confidence: 99%

XAFS Investigation of the Structure of Aqueous Thorium(IV) Species, Colloids, and Solid Thorium(IV) Oxide/Hydroxide

et al. 2002

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X-ray absorption fine structure (XAFS) spectroscopy at the Th L3 edge is applied for the characterization of crystalline, anhydrous ThO(2)(cr), microcrystalline ThO(2).xH(2)O(s), amorphous ThO(n)(OH)(4-2n).xH(2)O(am), aqueous Th(IV) solutions, and colloidal suspensions up to p(c)H 3.7. The microcrystalline, possibly hydrated thorium dioxide, is formed at p(c)H 1.5-2.5 by precipitation from suspensions of 16-23 nm thorium dioxide colloids. The solubility data determined for this solid is several orders of magnitude lower than the values for amorphous Th(IV) hydroxide or hydrous oxide. The EXAFS spectrum of the isolated microcrystalline particles shows that their structure is different from that of anhydrous crystalline ThO(2)(cr) and amorphous ThO(n)(OH)(4-2n).xH(2)O(am) precipitated at higher pH and dried at room temperature. The solubility measured for the amorphous Th(IV) precipitate is comparable to that previously reported for a solid prepared in a similar manner. In other solubility studies with amorphous Th(IV) hydroxide or hydrous oxide, considerably higher thorium concentrations are measured at p(c)H 3.5-5. The aqueous speciation is made by EXAFS for solutions prepared by careful coulometric titration under comparable conditions (p(c)H and thorium concentration). The spectra of these solutions demonstrate the presence of a large amount of Th(IV) polynuclear species or colloids of small size, having a highly asymmetric Th-O coordination. The EXAFS spectrum of these colloids is similar to that of the amorphous solid.

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Study of the L3 edges of ion-beam-mixed PdCu alloys by X-ray absorption spectroscopy

Cited by 7 publications

References 27 publications

In-situ vacuum deposition technique of lithium on neutron production target for BNCT

In-situ vacuum deposition technique of lithium on neutron production target for BNCT

XAFS and LIBD Investigation of the Formation and Structure of Colloidal Pu(IV) Hydrolysis Products

XAFS Investigation of the Structure of Aqueous Thorium(IV) Species, Colloids, and Solid Thorium(IV) Oxide/Hydroxide

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