Definition of partial structure factors and compositional short range order (CSRO)

2005 ◽  
pp. 10-19
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Partial Structure ◽  
Structure Factors ◽  
Definition Of

Topological and Chemical Short-Range Order in Undercooled and Stable Melts of Al13(Co,Fe)4 Alloys

2003 ◽  
Vol 805 ◽  
Author(s):  
Dirk Holland-Moritz ◽  
Thomas Schenk ◽  
Virginie Simonet ◽  
Robert Bellissent
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Electromagnetic Levitation ◽  
Processing Technique ◽  
Range Order ◽  
Partial Structure ◽  
Containerless Processing ◽  
Elastic Neutron ◽  
Structure Factors ◽  
Elastic Neutron Scattering

ABSTRACTThe short-range order of stable and deeply undercooled liquids of Al13(Co,Fe)4 alloys forming polytetrahedral phases is investigated by combining the containerless processing technique of electromagnetic levitation with elastic neutron scattering. Partial structure factors were inferred from the diffraction data which allow an analysis of both, the topological and the chemical short-range order of these alloy melts as a function of the temperature.

Diskussion der diffusen Laue-Streuung flüssiger Legierungen / Remarks on the Diffuse Laue-Scattering of Liquid Alloys

1972 ◽  
Vol 27 (6) ◽  
pp. 1018-1019
Author(s):  
H. Ruppersberg ◽  
K. Goebbels
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Liquid Alloys ◽  
Partial Structure ◽  
Structure Factors

AbstractPrepeaks in the partial structure factors of liquid alloys are interpreted as a modulation in the diffuse Laue-scattering, caused by chemical short range order. It is shown and experimentally confirmed that the partial structure factors can become lower than -1. It is unlikely that a modulation appears in only one of the three partials; rather a chemical short range order should be indicated in all three partial structure factors.

Partial structure factors and chemical short-range order in Ni33Y67and Cu33Y67metallic glasses

1987 ◽  
Vol 17 (2) ◽  
pp. 315-333 ◽  
Author(s):  
M Maret ◽  
P Chieux ◽  
P Hicter ◽  
M Atzmon ◽  
W L Johnson
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Partial Structure ◽  
Structure Factors

Partial Atomic Distribution Functions of Liquid Fe75B25

1988 ◽  
Vol 43 (2) ◽  
pp. 177-180 ◽  
Author(s):  
N. Mattern ◽  
W. Matz ◽  
H. Hermann
Keyword(s):  
Neutron Diffraction ◽  
Short Range ◽  
Short Range Order ◽  
Distribution Functions ◽  
Range Order ◽  
Experimental Results ◽  
Partial Structure ◽  
X Ray ◽  
Atomic Distribution ◽  
Structure Factors

Abstract Partial structure factors and atomic distribution functions for liquid Fe75 B25 were determined for the Fe-Fe and Fe-B pairs by means of X-ray and neutron diffraction. The experimental results show a strong chemical short-range order in the melt which is similar to that of amorphous Fe75B25.

Short Range Structure of Amorphous Ni50Ta50-Alloys by Means of X-Ray- and Neutron-Diffraction

1992 ◽  
Vol 47 (7-8) ◽  
pp. 826-832 ◽  
Author(s):  
H. Uhlig ◽  
L. Rohr ◽  
H.-J. Güntherodt ◽  
P. Fischer ◽  
P. Lamparter ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Short Range ◽  
Short Range Order ◽  
Nearest Neighbor ◽  
Range Order ◽  
Partial Structure ◽  
X Ray ◽  
Coordination Numbers ◽  
Binding Behavior ◽  
Structure Factors

Abstract Amorphous Ni50Ta50-samples with their high crystallization temperature of 985 K were investigated. To evaluate the three partial structure factors of amorphous Ni50Ta50 one X-ray diffraction experiment was performed with Ni50Ta50 and two neutron diffraction experiments with Co10Ni40Ta50 and with Ni50Ta50, respectively. The Bhatia-Thornton partial structure factor SCC(Q) indicates rather strong chemical short range order which also explains the premaximum observed in the Faber-Ziman partial SNiNi(Q)-function. The nearest neighbor distance is 2.82 Å for Ni-Ni, 2.91 Å for Ta-Ta, and is shortest for Ni-Ta, 2.44 Å. The coordination numbers are NNiNi = 4.9, NTaTa = 8.2, and NNiTa = 6.0. We report on the chemical short range order and the possible binding behavior in a-Ni50Ta50 and compare the present results with those reported in the literature on a-Ni40Ti60 as well as on a-Ni55Ta45

Topological and Chemical Short-Range Order in Undercooled and Stable Melts of Al13 (Co,Fe)4 Alloys

2003 ◽  
Vol 806 ◽  
Author(s):  
Dirk Holland-Moritz ◽  
Thomas Schenk ◽  
Virginie Simonet ◽  
Robert Bellissent
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Electromagnetic Levitation ◽  
Processing Technique ◽  
Range Order ◽  
Partial Structure ◽  
Containerless Processing ◽  
Elastic Neutron ◽  
Structure Factors ◽  
Elastic Neutron Scattering

ABSTRACTThe short-range order of stable and deeply undercooled liquids of Al13(Co,Fe)4 alloys forming polytetrahedral phases is investigated by combining the containerless processing technique of electromagnetic levitation with elastic neutron scattering. Partial structure factors were inferred from the diffraction data which allow an analysis of both, the topological and the chemical short-range order of these alloy melts as a function of the temperature.

Structural Investigation of the Metallic Glasses Mg85.5Cu14.5 and Mg70Zn30

1983 ◽  
Vol 38 (2) ◽  
pp. 142-148 ◽  
Author(s):  
E. Nassif ◽  
P. Lamparter ◽  
W. Sperl ◽  
S. Steeb
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Pair Correlation ◽  
Range Order ◽  
Order Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Factors ◽  
Similar Chemical ◽  
Total Structure

Abstract The total structure factors as well as the total pair correlation functions for amorphous Mg85.5Cu14.5 (by neutron and X-ray diffraction) and for amorphous Mg70Zn30 (by X-ray diffraction) were determined. Both alloys show similar chemical short range order effects. From the total pair correlation function of the Mg85.5Cu14.5 glass, partial coordination numbers and atomic distances could be extracted. Comparison with the structure of crystalline Mg2Cu suggests that the short range order around the copper atoms is similar in the amorphous and the crystalline phase. The densities of both amorphous alloys were measured yielding negative excess volumina.

Neutron- and X-ray-Diffraction Study on the Structure of Amorphous Co25Ti75

1987 ◽  
Vol 42 (1) ◽  
pp. 7-12 ◽  
Author(s):  
A. Müller ◽  
E. Bühler ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Diffraction Study ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Diffraction Experiment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Numbers ◽  
Structure Factors ◽  
Melt Spin

Amorphous Co25Ti75 could be produced using the melt-spin-technique. A neutron- and a X-ray-diffraction experiment was performed. Assuming SNC ≡ 0 the partial Bhatia Thornton structure factors SNN and SCC as well as the partial coordination numbers were calculated. The discussion yields the atomic distances and the chemical short range order parameters.

A Diffraction Study of Amorphous Si0.40C 0.24N0.36

1996 ◽  
Vol 51 (12) ◽  
pp. 1179-1184 ◽  
Author(s):  
H. Uhlig ◽  
M. Frieß ◽  
J. Dürr ◽  
R. Bellissent ◽  
H.-P. Lamparter ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Chemical Bonding ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Contrast Variation ◽  
X Ray ◽  
Structure Factors ◽  
Amorphous Si

Abstract In the present work, amorphous Si0.40C0.24N0.36 samples were investigated. X-ray and neutron diffraction experiments were performed, in order to evaluate the structure factors by the method of contrast variation. The structure can be described as crosslinked Si-N-C matrices. Within these matrices SiN4 tetrahedra are predominant. Direct Si-Si contact does not occur. We report on the short range order and the nature of chemical bonding.

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