scholarly journals Experimental methods in the study of neutron scattering at small angles

2014 ◽  
Author(s):  
Cristian A. Dragolici
Keyword(s):  
Neutron Scattering ◽  
Experimental Methods

scholarly journals Exploring molecular reorientations in amorphous and recrystallized felodipine at the microscopic level

RSC Advances ◽  
2020 ◽  
Vol 10 (61) ◽  
pp. 37346-37357
Author(s):  
A. Pajzderska ◽  
J. Jenczyk ◽  
J. P. Embs ◽  
J. Wąsicki
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Neutron Scattering ◽  
Experimental Methods ◽  
Microscopic Level ◽  
Nmr Relaxometry ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering

Molecular reorientations were studied in amorphous, partially and fully recrystallized felodipine using a set of experimental methods: high-resolution solid-state nuclear magnetic resonance (NMR), relaxometry NMR and quasielastic neutron scattering (QENS).

scholarly journals Optimizing Experiment Performance by Realistic Sample Simulations

2014 ◽  
Vol 996 ◽  
pp. 197-202
Author(s):  
Mirko Boin ◽  
Robert Charles Wimpory ◽  
Robin Woracek
Keyword(s):  
Residual Stress ◽  
Neutron Scattering ◽  
Experimental Methods ◽  
Stress Measurements ◽  
Experimental Configuration ◽  
Imaging Experiment

A simulation of realistic samples within a neutron scattering or imaging experiment has been created in order to support the accuracy, feasibility and analysis of residual stress measurements as well as the development of novel experimental methods and instrument components. Covering the influences of individual neutron instrument parameters, the simulation also assists in optimizing the experimental configuration towards precise measurements and effective usage of neutron beamtime.

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.

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