Anomalous x‐ray diffuse scattering of short‐range order in Nd2−xCexCuO4−y

1995 ◽  
Vol 77 (1) ◽  
pp. 34-40 ◽  
Author(s):  
X. B. Kan ◽  
H. Renevier ◽  
J. Quintana ◽  
J. L. Peng ◽  
J. B. Cohen
Keyword(s):  
Diffuse Scattering ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray

Diffuse scattering and short-range order in uranium iodine phthalocyanine [U1−x Pc2]I2−y and the X-ray structure analysis of crystals with diffuse superstructure reflections

2003 ◽  
Vol 59 (3) ◽  
pp. 384-392 ◽  
Author(s):  
J. Krawczyk ◽  
A. Pietraszko ◽  
R. Kubiak ◽  
K. Łukaszewicz
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Diffuse Scattering ◽  
Short Range ◽  
Short Range Order ◽  
Crystal Structure Analysis ◽  
Range Order ◽  
Small Range ◽  
X Ray ◽  
Unit Cells

Crystals of uranium iodine phthalocyanine present an example of a disordered commensurate modulated structure of the intergrowth type. The short-range order of both uranium ions and iodine chains [I_3^-] n has been analysed by Reverse Monte Carlo (RMC) simulation of X-ray diffuse scattering. The diffraction pattern of uranium iodine phthalocyanine contains diffuse superstructure reflections. In the routine crystal structure analysis diffuse superstructure reflections may be either omitted or measured and classified along with other Bragg reflections. The crystal structure of uranium iodine phthalocyanine is an example of such ambiguity. The crystal structures of two specimens of [U1−x Pc2]I2−y with slightly different composition have been published in the literature with different space groups and unit cells. We have shown that the structure of both specimens differs only in the degree of short-range order and is isostructural with [YbPc2]I2. We have also shown that while the omission of diffuse reflections results in the average crystal structure, the treatment of these reflections as normal Bragg reflections is incorrect and produces the structure averaged over a limited small range.

Magnetic short-range order in disordered and ordered binary alloys

2005 ◽  
Vol 220 (12) ◽  
Author(s):  
Ken-ichi Ohshima
Keyword(s):  
Diffuse Scattering ◽  
Short Range ◽  
Short Range Order ◽  
Binary Alloys ◽  
Range Order ◽  
X Ray ◽  
3D Metals ◽  
Ordered Alloys ◽  
Magnetic Fluctuation ◽  
Recent Developments

AbstractA review is given on the recent developments in the study of magnetic short-range order in disordered and ordered binary alloys. We describe the study of the correlation between atomic and magnetic short-range order, in which full use was made of the technique of simultaneous measurement of X-ray and neutron diffuse scattering from single crystals. The study of the effect of atomic order on magnetic fluctuation using the same technique is also described. These two studies cast new light in the understanding of the magnetic properties of the disordered and ordered alloys containing 3d-metals.

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