Determination of the thermodynamic factor for the B2 FeAl phase from X-ray diffuse scattering data

1998 ◽  
Vol 527 ◽  
Author(s):  
Vlad Liubich ◽  
Simon Dorfman ◽  
David Fuks ◽  
Helmut Mehrert
Keyword(s):  
Interdiffusion Coefficient ◽  
Order Parameter ◽  
Diffuse Scattering ◽  
Al Alloys ◽  
Scattering Data ◽  
Thermodynamic Factor ◽  
X Ray ◽  
X Ray Scattering ◽  
Feal Phase

ABSTRACTThe interdiffusion coefficient is related via the modified Darken equation to the tracer diffusivities of the constituents. The thermodynamic factor Φ entering the Darken equation for the interdiffusion coefficient is expressed in terms of the energy parameters which describe the ordering process in the binary alloy. Our calculations for Fe-Al alloys yield the dependence of Φ on the long-range order parameter. These calculations are performed with the parameters extracted from diffuse X-ray scattering data on FeAl.

Diffuse x-ray scattering from InGaAs/GaAs quantum dots

2003 ◽  
Vol 799 ◽  
Author(s):  
Rolf Köhler ◽  
Daniil Grigoriev ◽  
Michael Hanke ◽  
Martin Schmidbauer ◽  
Peter Schäfer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Synchrotron Radiation ◽  
Diffuse Scattering ◽  
Data Evaluation ◽  
X Ray ◽  
X Ray Scattering ◽  
Gaas Matrix ◽  
Wetting Layers ◽  
Ray Scattering

ABSTRACTMulti-fold stacks of In0.6Ga0.4As quantum dots embedded into a GaAs matrix were investigated by means of x-ray diffuse scattering. The measurements were done with synchrotron radiation using different diffraction geometries. Data evaluation was based on comparison with simulated distributions of x-ray diffuse scattering. For the samples under consideration ((001) surface) there is no difference in dot extension along [110] and [-110] and no directional ordering. The measurements easily allow the determination of the average indium amount in the wetting layers. Data evaluation by simulation of x-ray diffuse scattering gives an increase of Incontent from the dot bottom to the dot top.

scholarly journals Disorder in pentachloronitrobenzene, C6Cl5NO2: a diffuse scattering study

2007 ◽  
Vol 63 (4) ◽  
pp. 663-673 ◽  
Author(s):  
Lynne H. Thomas ◽  
T. Richard Welberry ◽  
Darren J. Goossens ◽  
Aidan P. Heerdegen ◽  
Matthias J. Gutmann ◽  
...  
Keyword(s):  
Diffuse Scattering ◽  
Short Range ◽  
Scattering Data ◽  
X Ray ◽  
Monte Carlo Computer Simulation ◽  
X Ray Scattering ◽  
Scattering Study ◽  
The Mean ◽  
Diffraction Patterns ◽  
Local Relaxation

Monte Carlo computer simulation has been used to interpret and model observed single-crystal diffuse X-ray scattering data for pentachloronitrobenzene, C6Cl5NO2. Each site in the crystal contains a molecule in one of six different basic orientations with equal probability. However, no short-range order amongst these different orientations has been detected. The strong, detailed and very distinctive diffraction patterns can be accounted for almost entirely on the assumption of random occupancy of each molecular site, but with very large local relaxation displacements that tend to increase the neighbouring distances for contacts involving NO2...NO2 and NO2...Cl with a corresponding reduction for those involving Cl...Cl. The results show that the mean NO2...NO2 distance is increased by ∼ 0.6 Å, compared with that given by the average structure determination.

Model-based approaches for the determination of lipid bilayer structure from small-angle neutron and X-ray scattering data

2012 ◽  
Vol 41 (10) ◽  
pp. 875-890 ◽  
Author(s):  
Frederick A. Heberle ◽  
Jianjun Pan ◽  
Robert F. Standaert ◽  
Paul Drazba ◽  
Norbert Kučerka ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Small Angle ◽  
Scattering Data ◽  
Bilayer Structure ◽  
X Ray ◽  
Model Based ◽  
X Ray Scattering ◽  
Ray Scattering

New methods of processing of anomalous X-ray scattering data for amorphous alloys I. Determination of partial structure factors

1990 ◽  
Vol 119 (2) ◽  
pp. 159-172 ◽  
Author(s):  
Yu.A. Babanov ◽  
R.Sh. Sadykova ◽  
V.R. Shvetsov ◽  
A.V. Serikov ◽  
A.L. Ageev ◽  
...  
Keyword(s):  
Amorphous Alloys ◽  
Scattering Data ◽  
Partial Structure ◽  
X Ray ◽  
New Methods ◽  
X Ray Scattering ◽  
Structure Factors ◽  
Ray Scattering

Determination of small alterations in the radius of gyration by small-angle X-ray scattering

1971 ◽  
Vol 4 (4) ◽  
pp. 317-318 ◽  
Author(s):  
I. Simon
Keyword(s):  
Small Angle ◽  
Direct Determination ◽  
Differential Method ◽  
Scattering Data ◽  
Radius Of Gyration ◽  
X Ray ◽  
X Ray Scattering ◽  
Colloid Particles ◽  
Ray Scattering

A differential method is presented for the evaluation of small-angle X-ray scattering data. The direct determination of slight changes in the radius of gyration of colloid particles is rendered possible by the method proposed.

Thermodynamic factor in interdiffusion in Fe-Al alloys from the diffuse X-ray scattering

1998 ◽  
Vol 258 (1-2) ◽  
pp. 65-68 ◽  
Author(s):  
Vlad Liubich ◽  
Simon Dorfman ◽  
David Fuks ◽  
Helmut Mehrer
Keyword(s):  
Al Alloys ◽  
Thermodynamic Factor ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
Sign in / Sign up

Export Citation Format

Share Document