Solving the 3D structure of metal nanoparticles

2007 ◽  
Vol 222 (11/2007) ◽  
Author(s):  
Anatoly Frenkel
Keyword(s):  
Metal Nanoparticles ◽  
Short Range ◽  
Short Range Order ◽  
3D Structure ◽  
Three Dimensional ◽  
X Ray ◽  
Particle Distributions ◽  
Structure Of Metal ◽  
X Ray Absorption

We discuss methods of Extended X-ray Absorption Fine-Structure (EXAFS) analysis that provide three-dimensional structural characterization of metal nanoparticles, both mono- and bi-metallic. For the bimetallic alloys, we use short range order measurements to discriminate between random and non-random inter-particle distributions of atoms. We also discuss the application of EXAFS to heterogeneous nanoparticle systems.

Short Range Order Structure Around Oxygen Atoms in the Superconductor Y-Ba-Cu-O

1987 ◽  
Vol 99 ◽  
Author(s):  
S. C. Woronick ◽  
W. Ng ◽  
A. Krol ◽  
B. X. Yang ◽  
Y. H. Kao ◽  
...  
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Local Environment ◽  
Order Structure ◽  
Total Electron Yield ◽  
Total Electron ◽  
X Ray ◽  
Superconducting Compound ◽  
X Ray Absorption ◽  
Oxygen Atoms

ABSTRACTSpectra of the oxygen K-edge extended x-ray absorption fine structure (EXAFS) of the superconducting compound Y-Ba-Cu-O were obtained by measuring the total electron yield as a function of incident x-ray energy at temperatures between 77K and 300K. This technique affords a convenient way for probing the local environment around the oxygen atoms and soft modes in the lattice.

scholarly journals Investigation of short-range structural order in Zr69.5Cu12Ni11Al7.5and Zr41.5Ti41.5Ni17glasses, using X-ray absorption spectroscopy andab initiomolecular dynamics simulations

2014 ◽  
Vol 21 (6) ◽  
pp. 1296-1304 ◽  
Author(s):  
Debdutta Lahiri ◽  
Surinder M. Sharma ◽  
Ashok K. Verma ◽  
B. Vishwanadh ◽  
G. K. Dey ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Metallic Glasses ◽  
Short Range ◽  
Short Range Order ◽  
Relative Importance ◽  
Chemical Order ◽  
X Ray ◽  
Glass Forming ◽  
Dynamics Simulations ◽  
X Ray Absorption

Short-range order has been investigated in Zr69.5Cu12Ni11Al7.5and Zr41.5Ti41.5Ni17metallic glasses using X-ray absorption spectroscopy andab initiomolecular dynamics simulations. While both of these alloys are good glass formers, there is a difference in their glass-forming abilities (Zr41.5Ti41.5Ni17> Zr69.5Cu12Ni11Al7.5). This difference is explained by inciting the relative importance of strong chemical order, icosahedral content, cluster symmetry and configuration diversity.

Studies of short range order structure in the high-Tc superconductor Y-Ba-Cu-O using X-ray absorption techniques

1989 ◽  
Vol 158 (1-3) ◽  
pp. 465-466 ◽  
Author(s):  
A. Krol ◽  
L.Y. Jang ◽  
S.C. Woronick ◽  
F. Xu ◽  
Y.D. Yao ◽  
...  
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Order Structure ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
X Ray Absorption

Short-range order of yttria doped zirconia powders studied by X-ray absorption (II)

1996 ◽  
Vol 239 (1) ◽  
pp. 71-76 ◽  
Author(s):  
L. Esquivias ◽  
C. Barrera-Solano ◽  
M. Piñero ◽  
C. Prieto
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray ◽  
X Ray Absorption ◽  
Zirconia Powders

Synthesis and Characterization of a Three-dimensional Porous Compound: [Cu(H2O)6][{Cu(H2O)2}2{Cu(H2O)4H4W12O42}] · 12H2O

2008 ◽  
Vol 63 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Chun-jing Zhang ◽  
Ya-guang Chen ◽  
Dong-mei Shi ◽  
Hai-jun Pang
Keyword(s):  
Aqueous Solution ◽  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
3D Structure ◽  
Three Dimensional ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy

A novel transition metal polyoxotungstate, [Cu(H2O)6][{Cu(H2O)2}2{Cu(H2O)4H4W12O42}] · 12H2O (1), has been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analysis, IR and UV/vis spectroscopy, and TG analysis. The paradodecatungstate anions [H2W12O42]10− are linked by CuO6 octahedra, forming a three-dimensional (3D) structure. The magnetic susceptibility of compound 1 in the temperature range 2 - 300 K shows the presence of antiferromagnetic interactions within the uniform Cu2・ ・ ・Cu3 chains

X-ray absorption fine structure study of short-range order of iron in Fe/Al multilayers

2000 ◽  
Vol 87 (10) ◽  
pp. 7218-7226 ◽  
Author(s):  
Dirk C. Meyer ◽  
Kurt Richter ◽  
Peter Paufler ◽  
Peter Gawlitza ◽  
Thomas Holz
Keyword(s):  
Fine Structure ◽  
Short Range ◽  
Short Range Order ◽  
Structure Study ◽  
Range Order ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Characterization of ultrathin Ge epilayers on (100) Si

1991 ◽  
Vol 69 (3-4) ◽  
pp. 246-254 ◽  
Author(s):  
J. -M. Baribeau ◽  
D. J. Lockwood ◽  
T. E. Jackman ◽  
P. Aebi ◽  
T. Tyliszczak ◽  
...  
Keyword(s):  
Strain Relaxation ◽  
Three Dimensional ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Transmission Electron ◽  
Short Period ◽  
Short Period Superlattices ◽  
Direct Band ◽  
X Ray Absorption

The understanding of the epitaxy of pure Ge layers on Si is an important step towards the synthesis of SimGen (m, n < 10 monolayers) short-period superlattices. The possibility of a direct band-gap character makes these structures extremely attractive. We have grown thin buried Gen ([Formula: see text] monolayers) films on (100) Si by molecular beam epitaxy and studied their structural properties by a variety of techniques including Raman scattering spectroscopy, glancing incidence X-ray reflection, Rutherford backscattering, transmission electron microscopy, and extended X-ray absorption fine structure analysis. All these techniques allowed detection of the thin Ge layers and provided information about the thickness, morphology, strain distribution, and interface sharpness of these heterostructures. The Ge„ films with [Formula: see text] had a two-dimensional nature and showed no sign of strain relaxation. Intermixing at the Si–Ge interfaces was present in all these films and estimated to be not more than two monolayers. This smearing at the interfaces may have contributed to the maintenance of that pseudomorphicity. A thicker Ge layer (n = 12) showed evidence of strain relaxation and clustering in three-dimensional islands.

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