Neutron diffraction studies of simple molecular liquids

1990 ◽  
Vol 12 (4-5) ◽  
pp. 543-557 ◽  
Author(s):  
J. C. Dore
Keyword(s):  
Neutron Diffraction ◽  
Molecular Liquids

Neutron diffraction studies of molecular liquids using the new detector system of the PSD diffractometer at the Budapest Research Reactor

2004 ◽  
Vol 350 (1-3) ◽  
pp. E865-E867 ◽  
Author(s):  
László Temleitner ◽  
György Mészáros ◽  
László Pusztai ◽  
Erzsébet Sváb
Keyword(s):  
Neutron Diffraction ◽  
Research Reactor ◽  
Detector System ◽  
Molecular Liquids

NEUTRON DIFFRACTION AND RMC MODELLING: COMPLEMENTARY TECHNIQUES FOR THE DETERMINATION OF DISORDERED STRUCTURES

1993 ◽  
Vol 07 (16n17) ◽  
pp. 2965-2980 ◽  
Author(s):  
R.L. McGREEVY
Keyword(s):  
Neutron Diffraction ◽  
Metallic Glasses ◽  
Disordered Materials ◽  
Molecular Liquids ◽  
X Ray ◽  
Magnetic Structures ◽  
Future Developments ◽  
Disordered Structures ◽  
Complementary Techniques

The use of neutron diffraction and RMC modelling in the determination of the structures of disordered materials is described. The principle of the method is outlined and then illustrated by examples including monatomic and binary liquids, molecular liquids, solutions and metallic glasses. The application to the determination of magnetic structures in disordered materials is also shown. Finally the extension to enable the combination of neutron and X-ray data, and possible future developments, are discussed.

Texture measurements in Al2O3 using BEKP

1994 ◽  
Vol 52 ◽  
pp. 608-609
Author(s):  
M. D. Vaudin ◽  
J. P. Cline
Keyword(s):  
Neutron Diffraction ◽  
Rapid Method ◽  
Crystallographic Orientation ◽  
Specimen Surface ◽  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Verification Method ◽  
Crystal Properties ◽  
Backscattered Electron

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

A study of oxygen and vacancy ordering in YBa2Cu3O7−x

1989 ◽  
Vol 47 ◽  
pp. 164-165
Author(s):  
Y. P. Lin ◽  
A. H. O’Reilly ◽  
J. E. Greedan ◽  
M. Post
Keyword(s):  
Electron Microscopy ◽  
Neutron Diffraction ◽  
Oxygen Content ◽  
Carbon Film ◽  
Nitrogen Atmosphere ◽  
Vacancy Ordering ◽  
Powder Samples ◽  
Vacancy Chains ◽  
Chain Ordering

In the basal planes of the orthorhombic YBa2Cu3O7-X compound with x=0.07, which has a Tc of around 90K, chains of copper-oxygen are formed along the [010] direction. Previous investigations on the variation of Tc with oxygen content have shown the existence of a plateau at Tc = 60K for x=0.3 to 0.4, suggesting the presence of a separate phase. This phase has also been identified to be orthorhombic, but with a 2x superlattice along [100] of the parent structure, and the superlattice has been attributed to the formation of alternating copper-oxygen and copper-vacancy chains. In our work, we have studied the chain ordering phenomenon by electron microscopy and neutron diffraction on samples with different oxygen contents. We report here some of our electron microscopy findings for samples with x=0.4.Powder samples of YBa2Cu3O7-X were prepared by controlled re-oxidation of previously reduced material. For electron microscopy, the sample was dry ground using a mortar and pestle in a dry nitrogen atmosphere without the use of any solvent and transferred dry onto holey carbon film for examination in a Philips CM12 microscope.

Ultrasonic Measurement of Sheet Steel Texture and Formability: Comparison with Neutron Diffraction and Mechanical Measurements

1990 ◽  
Vol 2 (1) ◽  
pp. 239-257
Author(s):  
A. V. Clark ◽  
R. B. Thompson ◽  
Y. Li ◽  
R. C. Reno ◽  
G. V. Blessing ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Sheet Steel ◽  
Ultrasonic Measurement ◽  
Mechanical Measurements
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