Neutron Scattering Facilities

1996 ◽  
pp. 29-29
Author(s):  
D. L. Price
Keyword(s):  
Neutron Scattering

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.

Molecular dynamics of cyclohexane guest molecules in the cyclohexane/thiourea inclusion compound: an incoherent quasielastic neutron scattering investigation

1998 ◽  
Vol 93 (4) ◽  
pp. 545-554 ◽  
Author(s):  
MATTHEW JONES ◽  
FRANCOIS GUILLAUME ◽  
KENNETH HARRIS ◽  
ABIL ALIEV ◽  
PASCALE GIRARD ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Neutron Scattering ◽  
Inclusion Compound ◽  
Guest Molecules ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering

Critical neutron scattering at the nematic-smectic a phase transition in CBOOA

1978 ◽  
Vol 3 ◽  
pp. 359-359
Author(s):  
H. M. Conrad ◽  
H. H. Stiller
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Smectic A ◽  
Smectic A Phase

Experimental techniques in neutron scattering

1972 ◽  
Vol 14 (7) ◽  
pp. 255-268
Author(s):  
P. Mériel
Keyword(s):  
Neutron Scattering ◽  
Experimental Techniques

Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering

1992 ◽  
Vol 2 (10) ◽  
pp. 1929-1939 ◽  
Author(s):  
Mariette Barthes ◽  
Juegen Eckert ◽  
Susanna W. Johnson ◽  
Jacques Moret ◽  
Basil I. Swanson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Modes
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