Characterization and modelling of germanium assembled crystals for the diffraction of thermal neutrons

2004 ◽  
Vol 37 (5) ◽  
pp. 732-742 ◽  
Author(s):  
Lucia Alianelli ◽  
Manuel Sánchez del Río ◽  
Roberto Felici
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Analytical Models ◽  
Thermal Neutrons ◽  
X Ray Diffraction ◽  
Real Crystal ◽  
X Ray

Two assembled germanium crystals, produced for use as neutron monochromators, are characterized by means of neutron and X-ray diffraction. The neutron and synchrotron experimental data (reflectivity profiles and topographs) are compared with calculations based on analytical models and Monte Carlo simulations. Our results show the limits of the standard theories and indicate that full Monte Carlo simulations can be a valid tool for interpreting real crystal reflectivities.

X-ray diffraction analysis and Monte Carlo simulations of CoFeB-MgO based magnetic tunnel junctions

2013 ◽  
Vol 113 (2) ◽  
pp. 023915 ◽  
Author(s):  
J. Kanak ◽  
P. Wiśniowski ◽  
T. Stobiecki ◽  
A. Zaleski ◽  
W. Powroźnik ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Diffraction Analysis ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
X Ray Diffraction ◽  
X Ray

Structure of Zinc Phosphate Glasses of 75 and 80 mole% ZnO Content Studied by X-Ray Diffraction and Reverse Monte Carlo Simulations

2005 ◽  
Vol 60 (7) ◽  
pp. 517-526 ◽  
Author(s):  
Uwe Hoppe ◽  
Yanko Dimitriev ◽  
Pal Jóvári
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
High Energy ◽  
Phosphate Glasses ◽  
Strong Increase ◽  
Reverse Monte Carlo ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Numbers ◽  
Q Factors

X-Ray diffraction, using high-energy photons from a synchrotron, was used to extend the investigation of (ZnO)x(P2O5)1−x glasses to samples of ZnO content close to x = 0.8 which were obtained by roller-quenching. The isolated PO4 tetrahedra are surrounded by ZnOn polyhedra, where Zn−O coordination numbers of ∼ 4.5 are determined. The small increase of NZnO from ∼ 4 at metaphosphate composition (x = 0.5) to ∼ 4.5 is not sufficient to explain the strong increase of the packing density beyond the minimum at x = 0.5. The medium-range order was analyzed on the basis of partial SPP(Q) and SZnZn(Q) factors obtained from Reverse Monte Carlo simulations of glasses with 0 ≤ x ≤ 0.8. The positions of the first peaks in these factors, the number densities of P and Zn atoms and knowledge of definite P-P and Zn-Zn distances were used to check the applicability of simple models such as the dense packing of uniform P- and Zn-centered spherical environments for glasses with x=0.8 and 0.5, the packing of corrugated sheets for vitreous P2O5 and the packing of phosphate chains for Zn metaphosphate glass.

scholarly journals Structural analysis of WO3-TeO2 glasses by neutron, high energy X-ray diffraction, reverse Monte Carlo simulations and XANES

2018 ◽  
Vol 495 ◽  
pp. 27-34 ◽  
Author(s):  
Atul Khanna ◽  
Margit Fábián ◽  
Hirdesh ◽  
P.S.R. Krishna ◽  
Christopher J. Benmore ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Structural Analysis ◽  
Monte Carlo Simulations ◽  
High Energy ◽  
Reverse Monte Carlo ◽  
X Ray Diffraction ◽  
X Ray
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