scholarly journals Static Atomic Displacements in Crystalline Solid Solution Alloys

1996 ◽  
Vol 437 ◽  
Author(s):  
Gene Ice ◽  
Cullie Sparks ◽  
J. Lee Robertson ◽  
J. Ernest Epperson ◽  
Xiaogang Jiang
Keyword(s):  
Synchrotron Radiation ◽  
Crystalline Solid ◽  
Local Order ◽  
Chemical Order ◽  
X Ray ◽  
Atomic Displacements ◽  
X Ray Scattering ◽  
New Information ◽  
Z Contrast

AbstractAtom size differences induce static displacements from an average alloy lattice and play an important role in controlling alloy phase stability and properties. The details of this role however, are difficult to study; chemical order and displacements are strongly interrelated and static displacements are hard to measure. Diffuse x-ray scattering measurements with tunable-synchrotron radiation can now measure element-specific static displacements with an accuracy of ± 0.1 pm and can simultaneously measure local chemical order out to 20 shells or more. Ideal alloys for diffuse scattering analysis with synchrotron radiation, are those that have previously been the most intractable: alloys with small Z contrast, alloys with only local order and alloys with small size differences. The combination of precise characterization of local chemical order and precise measurement of static displacement provides new information that challenges existing alloy models. We report on an ongoing systematic study of static displacements in the Fe/Ni/Cr alloys and compare the observed static displacements to the static displacements predicted by current theories. The availability of more brilliant 3rd generation hard x-ray sources will greatly enhance these measurements.

scholarly journals Precise and nondestructive characterization of a ‘buried’ nanostructure in a polymer thin film using synchrotron radiation ultra-small angle X-ray scattering

2012 ◽  
Vol 45 (3) ◽  
pp. 307-312 ◽  
Author(s):  
Takamichi Shinohara ◽  
Tomoko Shirahase ◽  
Daiki Murakami ◽  
Taiki Hoshino ◽  
Moriya Kikuchi ◽  
...  
Keyword(s):  
Thin Film ◽  
Synchrotron Radiation ◽  
Small Angle ◽  
Polymer Thin Film ◽  
X Ray ◽  
X Ray Scattering ◽  
Nondestructive Characterization ◽  
Ray Scattering

Anomalous X-Ray Scattering On Sr and Sr-Eu Metaphosphate Glasses

1996 ◽  
Vol 437 ◽  
Author(s):  
M. Bionducci ◽  
C. Meneghini ◽  
G. Navarra ◽  
G. Licheri ◽  
A. Balerna ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
European Synchrotron Radiation Facility ◽  
General Purpose ◽  
Local Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Experiment ◽  
The Eu ◽  
Ray Scattering

AbstractThe results of an Anomalous X-ray Scattering experiment performed on Sr(PO3)2 and Eu0.1Sr0.9(PO3)2.1 glasses are presented. These are the first measurements carried out on GILDA (General purpose Italian beamLine for Diffraction and Absorption) diffractometer, located at the European Synchrotron Radiation Facility (ESRF), Grenoble. To obtain detailed information about the local order on pure and Eu-doped Sr-metaphosphate glasses both samples were investigated near the Sr K-edge (16.107 KeV), while the latter was also studied near the Eu K-edge (48.517 KeV).

scholarly journals Static Displacements of Atoms in Crystalline Metallic Solid Solutions

1994 ◽  
Vol 375 ◽  
Author(s):  
Cullie Sparks ◽  
Gene Ice ◽  
Xiaogang Jiang ◽  
Paul Zschack
Keyword(s):  
Solid Solutions ◽  
Diffuse Scattering ◽  
Nearest Neighbor ◽  
Near Neighbor ◽  
Crystalline Solid ◽  
X Ray ◽  
Lattice Constants ◽  
Atomic Displacements ◽  
X Ray Scattering ◽  
Individual Bond

AbstractMeasurement of diffuse x-ray scattering from binary crystalline solid solutions at more than one x-ray energy is a sensitive probe of the average interatomic distance between neighboring pairs of atoms. Deviations of these bond distances by as little as 0.001Å are easily detected in the diffuse scattering from binary alloys consisting of atoms nearby in the periodic table and/or where x-ray energies chosen near their absorption edges can change the scattering contrast. Individual bond distances (AA, AB and BB) are recovered out to several near neighbor shells by combining three scattering measurements at x-ray energies chosen for maximum and minimum contrast. Average bond distances recovered from four metal alloys Fe77.5Ni22.5, Fe46.5Ni53.5Cr47Fe53and Cr20Ni80 are discussed. We find that the interatomic distances measured for these alloys give interesting insights to atomic displacements in solid solutions. Nearest neighbor bond distances are not well represented by phenomenological models based on pure element atomic size and concentration dependence of the lattice constants. Radial and nonradial displacements are recovered from these measurements of diffuse scattering.

Small angle X-ray scattering study of porosity variation in a styrene-divinylbenzene copolymer

1981 ◽  
Vol 46 (7) ◽  
pp. 1675-1681 ◽  
Author(s):  
Josef Baldrian ◽  
Božena N. Kolarz ◽  
Henrik Galina
Keyword(s):  
Small Angle ◽  
Structural Parameters ◽  
Two Phase ◽  
X Ray ◽  
Porosity Variation ◽  
Swelling Agent ◽  
X Ray Scattering ◽  
Styrene Divinylbenzene ◽  
Ray Scattering

Porosity variations induced by swelling agent exchange were studied in a styrene-divinylbenzene copolymer. Standard methods were used in the characterization of copolymer porosity in the dry state and the results were compared with related structural parameters derived from small angle X-ray scattering (SAXS) measurements as developed for the characterization of two-phase systems. The SAXS method was also used for porosity determination in swollen samples. The differences in the porosity of dry samples were found to be an effect of the drying process, while in the swollen state the sample swells and deswells isotropically.

First characterization of chemical environments using energy dispersive inelastic x-ray scattering induced by an x-ray tube

2021 ◽  
Vol 92 (1) ◽  
pp. 013102
Author(s):  
Roberto Daniel Pérez ◽  
Juan José Leani ◽  
José Ignacio Robledo ◽  
Héctor Jorge Sánchez
Keyword(s):  
Energy Dispersive ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
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