Characterization of the Local Structure of CeO2/ZrO2 by Pulsed Neutron Scattering

1997 ◽  
Author(s):  
T. Egami ◽  
W. Dmowski ◽  
R. Brezny
Keyword(s):  
Neutron Scattering ◽  
Local Structure ◽  
Pulsed Neutron

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.

scholarly journals Crystalline shielding mitigates structural rearrangement and localizes memory in jammed systems under oscillatory shear

2021 ◽  
Vol 7 (20) ◽  
pp. eabe3392
Author(s):  
Erin G. Teich ◽  
K. Lawrence Galloway ◽  
Paulo E. Arratia ◽  
Danielle S. Bassett
Keyword(s):  
Local Structure ◽  
Disordered Systems ◽  
Amorphous Materials ◽  
Structural Rearrangement ◽  
Oscillatory Shear ◽  
Disordered Materials ◽  
Rheological Measurements ◽  
Particle Level ◽  
Individual Particles

The nature of yield in amorphous materials under stress has yet to be fully elucidated. In particular, understanding how microscopic rearrangement gives rise to macroscopic structural and rheological signatures in disordered systems is vital for the prediction and characterization of yield and the study of how memory is stored in disordered materials. Here, we investigate the evolution of local structural homogeneity on an individual particle level in amorphous jammed two-dimensional (athermal) systems under oscillatory shear and relate this evolution to rearrangement, memory, and macroscale rheological measurements. We define the structural metric crystalline shielding, and show that it is predictive of rearrangement propensity and structural volatility of individual particles under shear. We use this metric to identify localized regions of the system in which the material’s memory of its preparation is preserved. Our results contribute to a growing understanding of how local structure relates to dynamic response and memory in disordered systems.

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