A SURFACE ANOMALOUS DIFFRACTION STUDY OF THE Ni(100)(3×3)-(Cs+O) SYSTEM

1999 ◽  
Vol 06 (05) ◽  
pp. 847-850 ◽  
Author(s):  
A. G. NORRIS ◽  
C. A. LUCAS ◽  
R. McGRATH ◽  
F. SCHEDIN ◽  
G. THORNTON ◽  
...  
Keyword(s):  
Fractional Order ◽  
Anomalous Scattering ◽  
Nickel Surface ◽  
Structural Determination ◽  
Nickel Substrate ◽  
X Ray Diffraction ◽  
Diffraction Intensity ◽  
Surface Layers ◽  
X Ray ◽  
Intensity Measurements

Alkali metal coadsorption systems represent a step along the pathway from simple model adsorbate overlayers to more technologically relevant real systems. However, such is their complexity that very few systems have been structurally determined. Here we present a surface X-ray diffraction investigation of one of these systems, Ni (100)-(3×3)- (Cs+O) . Here a structural determination is particularly challenging due to the presence of three species in the surface layers and by the size of the unit cell. As a first step, anomalous scattering has been used to determine whether there is a contribution of the nickel substrate to the fractional order diffraction intensity. Measurements of the fractional order rods at 10 eV and 200 V below the nickel K edge (8333 eV) were used to probe the nickel contribution to the fractional order rods. It was found that the intensity of the scattering was unchanged, indicating that the fractional order peaks are caused by scattering from the coadsorbates only. This shows that the nickel surface layers are not changed by the adsorption and thus sets a useful constraint on the number of possible structures.

scholarly journals Influence of the Outer Surface Layers of Crystals on the X-Ray Diffraction Intensity of Basal Reflections

2004 ◽  
Vol 52 (6) ◽  
pp. 680-692 ◽  
Author(s):  
Boris A. Sakharov ◽  
Alain Plançon ◽  
Bruno Lanson ◽  
Victor A. Drits
Keyword(s):  
Outer Surface ◽  
X Ray Diffraction ◽  
Diffraction Intensity ◽  
Surface Layers ◽  
X Ray

Quantitative Phase Analysis By Linear Regression of Chemistry on X-Ray Diffraction Intensity

1987 ◽  
Vol 2 (2) ◽  
pp. 96-98 ◽  
Author(s):  
Jacques Renault
Keyword(s):  
Linear Regression ◽  
Quantitative Information ◽  
Quantitative Phase Analysis ◽  
X Ray Diffraction ◽  
Diffraction Intensity ◽  
Mineralogical Analysis ◽  
X Ray ◽  
Reduction Program ◽  
Speed Of Analysis ◽  
Artificial Mixtures

AbstractXRF and XRD measurements made on a single pressed powder briquet can be combined to give more quantitative information than either technique employed alone. Speed of analysis and simplification of sample preparation are also enhanced. The algorithm presented here uses multiple linear regression of the concentrations of one or more elements on the corrected X-ray diffraction intensities of the phases containing them. The data reduction program runs on a microcomputer. Data are presented to show its application to mineralogical analysis of artificial mixtures of quartz, microcline (a feldspar) and calcite.

Features of Laser Treatment of Corrosion-Resistant Steels of Austenitic and Carbide Classes

2020 ◽  
Vol 989 ◽  
pp. 296-300
Author(s):  
Tatiana Vasilievna Tarasova ◽  
I.S. Belashova ◽  
S.D. Kuzmin ◽  
S.A. Egorov
Keyword(s):  
Heat Treatment ◽  
Fiber Laser ◽  
Laser Treatment ◽  
High Efficiency ◽  
Laser Heat Treatment ◽  
Laser Shock ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Corrosion Resistant ◽  
X Ray

In this paper effect of a fiber laser on the microstructure and properties of steels 95X18 and 12X18H10T is shown. The regularities of changes in the structure of a laser-treated surface by X-ray diffraction and X-ray microscopic analyzes were studied. The high efficiency of laser heat treatment of steel 95X18 with the subsequent tempering, to improve the tribological properties of the surface layers has been established. For steel 12X18H10T laser shock hardening method (405 HV) is recognized to be effective.

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