Anomalous Behavior in the Atomic Structure of Nb3Sn under High Pressure

In the present study, the local atomic structure of a Nb3Sn superconductor sample has been probed by X-ray absorption fine structure (XAFS) as a function of hydrostatic pressure (from ambient up to 26 GPa) using a diamond anvil cell set-up. The analysis of the Nb-K edge extended X-ray absorption fine structure (EXAFS) data was carried out combining standard multi shell structural refinement and reverse Monte Carlo method to provide detailed in situ characterization of the pressure-induced evolution of the Nb local structure in Nb3Sn. The results highlight a complex evolution of Nb chains at the local atomic scale, with a peculiar correlated displacement of Nb–Nb and Nb–Nb–Nb configurations. Such a local effect appears related to anomalies evidenced by X-ray diffraction in other superconductors belonging to the same A15 crystallographic structure.

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ChemInform Abstract: Extended X-Ray Absorption Fine Structure Studies of the Atomic Structure of Nanoparticles in Different Metallic Matrices

ChemInform ◽

10.1002/chin.200941226 ◽

2009 ◽

Vol 40 (41) ◽

Author(s):

S. H. Baker ◽

M. Roy ◽

S. J. Gurman ◽

C. Binns

Keyword(s):

Fine Structure ◽

Atomic Structure ◽

X Ray ◽

Absorption Fine ◽

Structure Of Nanoparticles ◽

X Ray Absorption

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Solving the Structure and Dynamics of Metal Nanoparticles by Combining X-Ray Absorption Fine Structure Spectroscopy and Atomistic Structure Simulations

Annual Review of Analytical Chemistry ◽

10.1146/annurev-anchem-061318-114929 ◽

2019 ◽

Vol 12 (1) ◽

pp. 501-522 ◽

Cited By ~ 13

Author(s):

J. Timoshenko ◽

Z. Duan ◽

G. Henkelman ◽

R.M. Crooks ◽

A.I. Frenkel

Keyword(s):

Fine Structure ◽

Three Dimensional ◽

Dimensional Structure ◽

Structural Refinement ◽

Particle Structure ◽

X Ray ◽

Structure And Dynamics ◽

Absorption Fine ◽

Metal Metal ◽

X Ray Absorption

Extended X-ray absorption fine structure (EXAFS) spectroscopy is a premiere method for analysis of the structure and structural transformation of nanoparticles. Extraction of analytical information about the three-dimensional structure and dynamics of metal–metal bonds from EXAFS spectra requires special care due to their markedly non-bulk-like character. In recent decades, significant progress has been made in the first-principles modeling of structure and properties of nanoparticles. In this review, we summarize new approaches for EXAFS data analysis that incorporate particle structure modeling into the process of structural refinement.

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Local Atomic Structure of a Clean Surface by Surface Extended X-Ray Absorption Fine Structure: Amorphized Si

Physical Review Letters ◽

10.1103/physrevlett.54.122 ◽

1985 ◽

Vol 54 (2) ◽

pp. 122-125 ◽

Cited By ~ 41

Author(s):

F. Comin ◽

L. Incoccia ◽

P. Lagarde ◽

G. Rossi ◽

P. H. Citrin

Keyword(s):

Fine Structure ◽

Atomic Structure ◽

Local Atomic Structure ◽

Clean Surface ◽

X Ray ◽

Absorption Fine ◽

X Ray Absorption

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Extended x-ray-absorption fine-structure study of the local atomic structure inAs+heavily implanted silicon

Physical Review B ◽

10.1103/physrevb.46.9434 ◽

1992 ◽

Vol 46 (15) ◽

pp. 9434-9445 ◽

Cited By ~ 37

Author(s):

J. L. Allain ◽

J. R. Regnard ◽

A. Bourret ◽

A. Parisini ◽

A. Armigliato ◽

...

Keyword(s):

Fine Structure ◽

Atomic Structure ◽

Structure Study ◽

Local Atomic Structure ◽

X Ray ◽

Absorption Fine ◽

X Ray Absorption

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Extended X-ray absorption fine structure of bimetallic nanoparticles

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.2.28 ◽

2011 ◽

Vol 2 ◽

pp. 237-251 ◽

Cited By ~ 20

Author(s):

Carolin Antoniak

Keyword(s):

Magnetic Properties ◽

Fine Structure ◽

Wavelet Transforms ◽

Density Functional ◽

Bimetallic Nanoparticles ◽

Crystallographic Structure ◽

Fept Nanoparticles ◽

X Ray ◽

Absorption Fine ◽

X Ray Absorption

Electronic and magnetic properties strongly depend on the structure of the material, especially on the crystal symmetry and chemical environment. In nanoparticles, the break of symmetry at the surface may yield different physical properties with respect to the corresponding bulk material. A useful tool to investigate the electronic structure, magnetic behaviour and local crystallographic structure is X-ray absorption spectroscopy. In this review, recent developments in the field of extended X-ray absorption fine structure measurements and in the analysis methods for structural investigations of bimetallic nanoparticles are highlighted. The standard analysis based on Fourier transforms is compared to the relatively new field of wavelet transforms that have the potential to outperform traditional analysis, especially in bimetallic alloys. As an example, the lattice expansion and inhomogeneous alloying found in FePt nanoparticles is presented, and this is discussed below in terms of the influence of employed density functional theory calculations on the magnetic properties.

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