Analysis of Single-Crystal Neutron Diffuse Scattering from Ice Ih

1997 ◽  
Vol 101 (32) ◽  
pp. 6188-6191 ◽  
Author(s):  
M. N. Beverley ◽  
V. M. Nield
Keyword(s):  
Single Crystal ◽  
Diffuse Scattering

Influence of magnetism on chemical order in a FeAl19.5at single crystal. High temperature measurements of neutron diffuse scattering

1991 ◽  
Vol 1 (2) ◽  
pp. 247-260 ◽  
Author(s):  
V. Pierron-Bohnes ◽  
M. C. Cadeville ◽  
A. Finel ◽  
O. Schaerpf
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Diffuse Scattering ◽  
Temperature Measurements ◽  
Chemical Order ◽  
High Temperature Measurements

Real-space refinement of single-crystal electron diffuse scattering and its application to Bi2Ru2O7−δ

2007 ◽  
Vol 19 (33) ◽  
pp. 335216 ◽  
Author(s):  
A L Goodwin ◽  
R L Withers ◽  
H-B Nguyen
Keyword(s):  
Single Crystal ◽  
Diffuse Scattering ◽  
Real Space ◽  
Crystal Electron

Short range order in a single crystal of Fe-19.5 at.% Al in the ferromagnetic range measured through X-ray diffuse scattering

1990 ◽  
Vol 38 (12) ◽  
pp. 2701-2710 ◽  
Author(s):  
V. Pierron-Bohnes ◽  
S. Lefebvre ◽  
M. Bessiere ◽  
A. Finel
Keyword(s):  
Single Crystal ◽  
Diffuse Scattering ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray

Scientific Review: Prospects and Challenges in Single Crystal Diffuse Scattering

Neutron News ◽  
2004 ◽  
Vol 15 (4) ◽  
pp. 1-1
Author(s):  
Stephan Rosenkranz ◽  
Ray Osborn
Keyword(s):  
Single Crystal ◽  
Diffuse Scattering ◽  
Scientific Review

NEUTRON DIFFUSE SCATTERING IN LEAD-BASED RELAXOR FERROELECTRICS AND ITS RELATIONSHIP TO THE ULTRA-HIGH PIEZOELECTRICITY

2012 ◽  
Vol 02 (02) ◽  
pp. 1241005 ◽  
Author(s):  
PETER M. GEHRING
Keyword(s):  
Dielectric Properties ◽  
Single Crystal ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Diffuse Scattering ◽  
Short Range ◽  
Piezoelectric Coefficient ◽  
Relaxor Ferroelectrics ◽  
Scattering Measurements

A brief review is presented that summarizes recent neutron diffuse scattering measurements on single crystal PbMg1/3Nb2/3O3 (PMN) and PbZn1/3Nb2/3O3 (PZN) doped with PbTiO3 (PT). Emphasis is placed on results that suggest that the short-range, polar correlations observed in these systems are connected to the anomalous relaxor dielectric properties, and in particular to the large values of the piezoelectric coefficient d33 near the morphotropic phase boundary.

scholarly journals Diffuse scattering from the lead-based relaxor ferroelectric PbMg1/3Ta2/3O3

2011 ◽  
Vol 44 (3) ◽  
pp. 603-609 ◽  
Author(s):  
Antonio Cervellino ◽  
S. N. Gvasaliya ◽  
O. Zaharko ◽  
B. Roessli ◽  
G. M. Rotaru ◽  
...  
Keyword(s):  
Single Crystal ◽  
Atomic Structure ◽  
Diffuse Scattering ◽  
Relaxor Ferroelectric ◽  
The Other ◽  
X Ray Diffraction ◽  
Correlation Lengths ◽  
X Ray ◽  
Displacement Vectors ◽  
Polar Nanoregions

The relaxor ferroelectric PbMg1/3Ta2/3O3was studied by single-crystal neutron and synchrotron X-ray diffraction, and its detailed atomic structure modelled in terms of static Pb displacements that lead to the formation of polar nanoregions. Similar to the other members of the Pb-based relaxor family like PbMg1/3Nb2/3O3or PbZn1/3Nb2/3O3the diffuse scattering in the [H00]/[0K0] scattering plane has a butterfly shape around theh00 Bragg reflections and is orthogonal to the scattering vector forhh0 peaks. In the [HH0]/[00L] plane the diffuse scattering is elongated along the 〈112〉 directions and is orthogonal to the scattering vector forhhhreflections. It is found that a model consisting of correlated Pb displacements along the 〈111〉 directions reproduces adequately the main features of the diffuse scattering in PbMg1/3Ta2/3O3when the correlation lengths between the Pb-ion displacement vectors are longest along the 〈111〉 and shortest along the 〈11{\overline 2}〉 and 〈1{\overline 1}0〉 directions.

An improved method for analysing single crystal diffuse scattering using the Reverse Monte Carlo technique

1997 ◽  
Vol 212 (11) ◽  
Author(s):  
Th. Proffen ◽  
T. R. Welberry
Keyword(s):  
Monte Carlo ◽  
Single Crystal ◽  
Diffuse Scattering ◽  
Crystal Size ◽  
Simulation Technique ◽  
Reverse Monte Carlo ◽  
Improved Method ◽  
Model Crystal ◽  
Small Crystal ◽  
Diffraction Patterns

AbstractAn improved method for the analysis of single crystal diffuse scattering using the Reverse Monte Carlo (RMC) simulation technique is presented. Previous RMC studies showed that with respect to the size of the model crystal used for the simulation there are two conflicting requirements. A large crystal size gives relatively noise-free calculated diffraction patterns, but it is found that the ‘fit’ that is obtained has been achieved by adjusting the large number of high-order correlations in the structure rather than the relatively few low-order correlations of interest. On the other hand a small crystal size necessarily gives a defect structure characterised by short-range correlations, but gives a diffraction pattern so noisy that it cannot meaningfully be fitted to the observed data. The procedure described here overcomes this problem by using a quite different way of calculating the diffuse scattering intensity. Rather than computing the Fourier transform of the complete model crystal, the intensity is taken as the average of scattering intensities of many small crystal volumes (lots) chosen at random. This produces high quality diffraction patterns and at the same time restricts the effect of the RMC refinement to correlation vectors no greater than the lot size.The viability of this modified RMC method compared to the ‘normal’ RMC simulation technique is investigated using as input the calculated diffuse intensity of simple two dimensional (2D) model examples with known disorder properties.

Evidence of Forbidden Reflections in the Diffuse Scattering of Hg0.80Cd0.20Te Single Crystals

1990 ◽  
Vol 209 ◽  
Author(s):  
J. P. Quintana
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Diffuse Scattering ◽  
Anomalous Dispersion ◽  
Scattering Pattern ◽  
X Ray ◽  
Zinc Blende ◽  
Zinc Blende Structure

ABSTRACTThe x-ray diffuse scattering pattern from a commercial bulk n-type Hg0.80Cd0.20Te single crystal was measured in absolute units. Anomalous dispersion techniques near the Hg LIII edge were used to determine theintensity due to Hg interactions. Diffuse x-ray superlattice reflections are reported that are forbidden by the zinc-blende structure. The systematic absences in these peaks eliminate the possibility that they are the result of a Cu3Au ordering scheme.

A single-crystal time-of-flight neutron diffractometer at a spallation neutron source

2007 ◽  
Vol 40 (4) ◽  
pp. 799-807 ◽  
Author(s):  
Miwako Takahashi ◽  
Ken-ichi Ohshima ◽  
Masatoshi Arai
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Neutron Source ◽  
Diffuse Scattering ◽  
Time Of Flight ◽  
Magnetic Scattering ◽  
Spallation Neutron Source ◽  
Neutron Diffractometer ◽  
Incommensurate Structures ◽  
Asymmetric Pulse

A single-crystal diffractometer using the time-of-flight (TOF) Laue technique had been operated for studies of structural and magnetic disorder and phase transitions in alloys and magnetic materials at the pulsed spallation neutron source facility of the KEK Neutron Science Laboratory (KENS). In various sample environments, the diffractometer has demonstrated its usefulness in measurements of diffuse scattering for studying local structures, and in surveys of reciprocal space for studying phase transitions and incommensurate structures under the conditions of varying temperature and magnetic field. Particular emphasis is placed on the fact that though the instrument did not receive high-flux neutrons for long wavelengths suitable for the studies of magnetic scattering, it gave good results on the observations of magnetic diffuse scattering and superlattice reflections. Remarks and future tasks of the TOF Laue technique are discussed in relation to the asymmetric pulse shape, separation of the inelastic scattering, and dependence of data correction on the sample quality.

Single crystal x-ray diffuse scattering studies of the intermolecular interactions in solid C60

1997 ◽  
Vol 86 (1-3) ◽  
pp. 2327-2328 ◽  
Author(s):  
R. Moret ◽  
P. Launois ◽  
S. Ravy ◽  
M. Julier ◽  
J.M. Godard
Keyword(s):  
Single Crystal ◽  
Intermolecular Interactions ◽  
Diffuse Scattering ◽  
X Ray
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