Local structure of Al75(Mn,Cr,Ru,Re,Si)25 icosahedral alloys studied by pulsed neutron scattering (abstract)

1988 ◽  
Vol 63 (8) ◽  
pp. 4070-4070
Author(s):  
W. Dmowski ◽  
T. Egami ◽  
P. A. Bancel ◽  
P. A. Heiney ◽  
K. Volin
Keyword(s):  
Neutron Scattering ◽  
Local Structure ◽  
Pulsed Neutron

Local structure of YBa2Cu4O8 determined by pulsed neutron scattering: An evidence of charge inhomogeneity in the plane

1994 ◽  
Vol 235-240 ◽  
pp. 1229-1230 ◽  
Author(s):  
T. Egami ◽  
T.R. Sendyka ◽  
W. Dmowski ◽  
D. Louca ◽  
H. Yamauchi ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Local Structure ◽  
Pulsed Neutron

Local atomic structure of relaxor ferroelectric solids studied by pulsed neutron scattering

1994 ◽  
Vol 52 ◽  
pp. 554-555
Author(s):  
T. Egami ◽  
H. D. Rosenfeld ◽  
S. Teslic
Keyword(s):  
Neutron Scattering ◽  
Atomic Structure ◽  
Argonne National Laboratory ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Crystallographic Structure ◽  
Chemical Inhomogeneity ◽  
Distribution Analysis ◽  
Ferroelectric Transition ◽  
Pulsed Neutron

Relaxor ferroelectrics, such as Pb(Mg1/3Nb2/3)O3 (PMN) or (Pb·88La ·12)(Zr·65Ti·35)O3 (PLZT), show diffuse ferroelectric transition which depends upon frequency of the a.c. field. In spite of their wide use in various applications details of their atomic structure and the mechanism of relaxor ferroelectric transition are not sufficiently understood. While their crystallographic structure is cubic perovskite, ABO3, their thermal factors (apparent amplitude of thermal vibration) is quite large, suggesting local displacive disorder due to heterovalent ion mixing. Electron microscopy suggests nano-scale structural as well as chemical inhomogeneity.We have studied the atomic structure of these solids by pulsed neutron scattering using the atomic pair-distribution analysis. The measurements were made at the Intense Pulsed Neutron Source (IPNS) of Argonne National Laboratory. Pulsed neutrons are produced by a pulsed proton beam accelerated to 750 MeV hitting a uranium target at a rate of 30 Hz. Even after moderation by a liquid methane moderator high flux of epithermal neutrons with energies ranging up to few eV’s remain.

Pulsed neutron scattering on molten Bi + BiI3 mixtures

1981 ◽  
Vol 83 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Kazuhiko Ichikawa ◽  
Takaaki Matsumoto
Keyword(s):  
Neutron Scattering ◽  
Pulsed Neutron

Comparison of Small-Angle Neutron Scattering of δ' Precipitation in an Al–Li Alloy at a High-Flux Reactor and at a Pulsed-Neutron Source

1997 ◽  
Vol 30 (5) ◽  
pp. 602-606 ◽  
Author(s):  
G. Albertini ◽  
F. Carsughi ◽  
R. Coppola ◽  
R. K. Heenan ◽  
M. Stefanon
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Size Distribution Function ◽  
Data Sets ◽  
Flux Reactor ◽  
Average Size ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source ◽  
Good Agreement

Two different small-angle neutron scattering (SANS) facilities, the D11 camera at the Institut Laue–Langevin (ILL, Grenoble, France) and the LOQ time-of-flight diffractometer at the Rutherford Appleton Laboratory (RAL, Didcot, Oxon, England), were used in the investigations of δ′-Al3Li precipitation at 463 K in Al–Li 3% alloy. The results obtained from the steady-state reactor and from the pulsed source by using two different data-acquisition techniques and two different procedures for data analysis are compared. The SANS curves for the same set of samples investigated using the two different instruments are in good agreement within the experimental uncertainties. A check was also made on the metallurgically relevant quantities, namely the average size and the size-distribution function of the δ′ precipitates at the various stages of the ageing process, obtained from the two sets of SANS curves by applying the same numerical method. Good agreement was found between the results from the two data sets.

X-ray diffraction, neutron scattering and EXAFS spectroscopy of monoclinic zirconia: analysis by Rietveld refinement and reverse Monte Carlo simulations

2002 ◽  
Vol 35 (4) ◽  
pp. 434-442 ◽  
Author(s):  
Markus Winterer ◽  
Robert Delaplane ◽  
Robert McGreevy
Keyword(s):  
Monte Carlo ◽  
Neutron Scattering ◽  
Rietveld Refinement ◽  
Local Structure ◽  
Exafs Spectroscopy ◽  
Scattering Data ◽  
Accurate Information ◽  
Reverse Monte Carlo ◽  
Monoclinic Zirconia ◽  
X Ray

Extended X-ray absorption fine structure (EXAFS) and neutron scattering data from monoclinic zirconia are analysed independently and simultaneously by reverse Monte Carlo (RMC) modelling. X-ray and neutron powder diffraction data are analysed by Rietveld refinement. The results are compared with respect to the local structure around the zirconium cations. Monoclinic zirconia was chosen as a model system for the comparison of structural information obtained by EXAFS spectroscopy and scattering methods because it is crystalline but also has some local disorder. In the case of zirconia, analysis of EXAFS spectra by RMC modelling results in reliable and accurate information on the local structure, consistent with neutron scattering and diffraction experiments.

Phase behavior and local structure of a binary mixture in pores: Mean-field lattice model calculations for analyzing neutron scattering data

2005 ◽  
Vol 122 (12) ◽  
pp. 124510 ◽  
Author(s):  
Dirk Woywod ◽  
Sebastian Schemmel ◽  
Gernot Rother ◽  
Gerhard H. Findenegg ◽  
Martin Schoen
Keyword(s):  
Binary Mixture ◽  
Neutron Scattering ◽  
Phase Behavior ◽  
Lattice Model ◽  
Local Structure ◽  
Mean Field ◽  
Scattering Data ◽  
Model Calculations

Pulsed Neutron Scattering for the 21st Century

Physics Today ◽  
2006 ◽  
Vol 59 (5) ◽  
pp. 44-49 ◽  
Author(s):  
Thomas E. Mason
Keyword(s):  
Neutron Scattering ◽  
21St Century ◽  
Pulsed Neutron
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