Powder neutron-diffraction profile analysis of zero-dimensional H-bonded crystal HCrO2

1999 ◽  
Vol 60 (11) ◽  
pp. 1875-1880 ◽  
Author(s):  
M. Ichikawa ◽  
T. Gustafsson ◽  
I. Olovsson ◽  
T. Tsuchida
Keyword(s):  
Neutron Diffraction ◽  
Profile Analysis ◽  
Diffraction Profile ◽  
Powder Neutron Diffraction

The structure of uranium tribromide by neutron diffraction profile analysis

1975 ◽  
Vol 39 (2) ◽  
pp. 265-270 ◽  
Author(s):  
John H. Levy ◽  
John C. Taylor ◽  
Paul W. Wilson
Keyword(s):  
Neutron Diffraction ◽  
Profile Analysis ◽  
Diffraction Profile

The structures of some titanium-niobium oxides by powder neutron diffraction

1974 ◽  
Vol 338 (1614) ◽  
pp. 311-326 ◽  
Keyword(s):  
Neutron Diffraction ◽  
Profile Analysis ◽  
Detailed Examination ◽  
Ionic Model ◽  
Space Group ◽  
Cell Parameters ◽  
Powder Neutron Diffraction ◽  
Crystallographic Shear ◽  
Final Profile ◽  
Block Structures

The structures of TiNb 2 O 7 and ortho - Ti 2 Nb 10 O 29 have been examined at 4.2 K by total profile analysis of powder neutron diffraction data. The space group of TiNb 2 O 7 is A2/m and the cell parameters are a = 11.890(5), b = 3.804(2), c = 20.373(9) Å, ‡ β = 120.199 (3) deg. The final profile residual was 9.47%. The space group of ortho-Ti 2 Nb 10 O 29 is Amma and the cell parameters are a = 28.305(12), b = 3.780(2), c = 20.352(9) Å. A final profile residual of 10.62% was obtained. Substantial ordering of the cations among the different metal sites in these block structures was found, with titanium occupancy numbers varying from 14.0 to 64.5% for TiNb 2 O 7 and from 4.5 to 40.0% in ortho-Ti 2 Nb 10 O 29 . The values are consistent with site potentials obtained on an ionic model. The oxygen positions were determined with greater precision than in previous studies of block structures, affording a detailed examination of the dis­tortions around the crystallographic shear planes.

Neutron Diffraction Profile Analysis to Determine Dislocation Density and Grain Size for Drawn Steel Wires

2007 ◽  
Vol 539-543 ◽  
pp. 2281-2286 ◽  
Author(s):  
S. Ryufuku ◽  
Yo Tomota ◽  
Y. Shiota ◽  
T. Shiratori ◽  
Hiroshi Suzuki ◽  
...  
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
Neutron Diffraction ◽  
Profile Analysis ◽  
Strengthening Mechanism ◽  
Point Of View ◽  
Diffraction Profile ◽  
Petch Relation ◽  
Steel Wires ◽  
Carbon Concentrations

Dislocation density and crystallite size of steel wires with various carbon concentrations and drawing strains were determined by profile analyses for neutron diffraction profiles. The density is found to increase while the size decreases with increasing of carbon concentration and/or drawing strain. Both of the Bailey-Hirsch relation and Hall-Petch relation hold for the present results to suggest that these two are not independent., i.e., indicating an identical strengthening mechanism from a different point of view.

A NEUTRON DIFFRACTION STUDY OF A SUPERCONDUCTING CUPRATE OF THE Bi–Ca–Sr–Cu–O SYSTEM CONTAINING TWO Cu-O SHEETS

1989 ◽  
Vol 03 (03) ◽  
pp. 445-454 ◽  
Author(s):  
A. SEQUEIRA ◽  
H. RAJAGOPAL ◽  
L. GANAPATHI ◽  
R. VIJAYARAGHAVAN ◽  
C. N. R. RAO
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Profile Analysis ◽  
Neutron Diffraction Study ◽  
Diffraction Profile ◽  
Space Group

The structure of a nominally Ca-rich composition of the n = 2 member of the Bi 2 (Ca, Sr) n+1 Cu n O 2n+4 series has been investigated by neutron diffraction profile analysis. The results suggest that the Amaa space group may be more appropriate than the Fmmm space group.

Single-Line Diffraction Profile Analysis Method Used for Evaluation of Microstructural Parameters in the Plain Ferritic Steel upon Tensile Straining

2008 ◽  
Vol 571-572 ◽  
pp. 181-188 ◽  
Author(s):  
Vadim Davydov ◽  
Petr Lukáš ◽  
Pavel Strunz ◽  
Radomír Kužel
Keyword(s):  
Neutron Diffraction ◽  
Ferritic Steel ◽  
Tensile Deformation ◽  
Profile Analysis ◽  
Plastic Region ◽  
Model Fitting ◽  
Real Space ◽  
Single Line ◽  
Diffraction Profile ◽  
Microstructural Parameters

The modification of the Transformed Model Fitting /TMF/ [1] method developed for evaluation of the single-line profiles from high-resolution neutron powder diffractometers is proposed [2]. More sophisticated real-space model [3] is used for the distortion and crystallite size broadening of the diffraction lines. The new PC program based on this model has been tested on neutron diffraction profiles collected in situ upon tensile deformation tests of the plain ferritic steel. The deformation test was performed in the incremental mode in which each individual deformation step was followed by unloading. The neutron diffraction spectra were collected both upon loading and unloading and behavior of the diffraction profiles in elastic as well as in plastic region of the deformation curve was examined in detail. Comparison of microstress values in loaded/unloaded state and in elastic and plastic region offers interesting possibility to separate the contribution of the type II and type III microstresses.

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