Short-range order in amorphous FeTb

1990 ◽  
Vol 48 (4) ◽  
pp. 120-121
Author(s):  
M. Tewes ◽  
J. Zweck ◽  
H. Hoffmann
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Structural Data ◽  
Distribution Functions ◽  
Range Order ◽  
Electron Diffraction Data ◽  
Storage Media ◽  
Mean Dimension ◽  
The Mean ◽  
Pair Distribution Functions

The importance of amorphous rare-earth/transition-metal (Re-TM) alloys for use as magneto-optic (MO) storage media has been shown first in 1973. First atomic structural data of amorphous Fe2Tb were given in 1974 and compared with those of a crystalline counterpart, which is the well-known Laves phase. Significant differences of short range order (sro) in amorphous and crystalline Fe2Tb have been found. Similiar results were given in 1986 for a composition Fe79Tb21, to be used for MO-recording.In this work we present pair distribution functions (PDF’s) determined from electron diffraction data for amorphous FeTb alloys. It has been shown that Fourier transformation of the experimental observed diffraction intensities gives the original infinite lattice of an investigated (crystalline) specimen multiplied by its selfcorrelation-function. Therefore the PDF approaches zero for r-values greater than the distance ro representing the mean dimension of a crystal.

scholarly journals Analysis of short-range order in Cu3Au using X-ray pair distribution functions

2017 ◽  
Vol 125 ◽  
pp. 15-26 ◽  
Author(s):  
L.R. Owen ◽  
H.Y. Playford ◽  
H.J. Stone ◽  
M.G. Tucker
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Distribution Functions ◽  
Range Order ◽  
X Ray ◽  
Pair Distribution Functions

Investigations of short range order in amorphous Fe-B alloys

1988 ◽  
Vol 46 ◽  
pp. 458-459
Author(s):  
J. Zweck ◽  
H. Hoffmann
Keyword(s):  
Physical Properties ◽  
Short Range ◽  
Short Range Order ◽  
Amorphous State ◽  
High Resolution Electron Microscopy ◽  
Near Neighbor ◽  
Distribution Functions ◽  
Range Order ◽  
Resolution Electron ◽  
Pair Distribution Functions

Amorphous metallic alloys exhibit a large variety of physical properties that often differ from their crystalline counterparts of the same composition. Currently, metallic glasses exist which, to name only a few examples, are either very non-abrasive, soft magnetic and magneto optical, hard, flexible, or resistant to corrosion. These properties are of great technical importance and there are many applications that are based on amorphous alloys. Since physical properties are related to the structure of a material, a better knowledge of the ‘structure’ of the amorphous state is of great interest. In this work, we present pair distribution functions determined from electron diffraction results for amorphous Fe-B alloys of different compositions. From the pair distribution functions one can obtain information about near neighbor distances, the range of a short range order (SRO) for different compositions, and of similarities to crystalline counterparts. These findings will also be compared to results obtained with the use of high resolution electron microscopy (HREM).

Structure of shear bands in Pd40Ni40P20 bulk metallic glass

2009 ◽  
Vol 24 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Y.M. Chen ◽  
T. Ohkubo ◽  
T. Mukai ◽  
K. Hono
Keyword(s):  
Electron Microscopy ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Short Range ◽  
Short Range Order ◽  
Shear Bands ◽  
Distribution Functions ◽  
Uniform Thickness ◽  
Transmission Electron ◽  
Pair Distribution Functions

The atomic structure of shear bands in Pd40Ni40P20 bulk metallic glass has been compared to an undeformed matrix phase using pair distribution functions (PDFs) derived from energy filtered nanobeam electron diffraction. Shear bands do not show any characteristic contrast in transmission electron microscopy (TEM) images when specimens are prepared with uniform thickness. PDFs from a shear band exhibit a slight decrease in the first peak, indicating a slight difference in packing density and short range order compared to the undeformed matrix.

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.

Correlations and Ordering in (GaSb)1−xGe2x Alloys

1986 ◽  
Vol 77 ◽  
Author(s):  
Kathie E. Newman ◽  
Bing-Lin Gu ◽  
P. A. Fedders
Keyword(s):  
Phase Transition ◽  
Bond Length ◽  
Long Range ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Exafs Data ◽  
Disorder Transition ◽  
Vegard’S Law ◽  
The Mean

ABSTRACTThe semiconducting alloy (GaSb)1−x Ge2x is an example of a mixed crystalline alloy that undergoes a phase transition between its constituent crystal types. The order-disorder transition modifies both the long-range and short-range order in the alloy as a function of composition x. By using the Kikuchi approximation, the bond probabilities are calculated and then compared with EXAFS data. These calculations show that the EXAFS data are consistent with the existence in (GaSb)1−x Ge2x of “wrong” bonds of Ga-Ga and Sb-Sb. The theory also predicts a violation of Vegard's Law for the behavior of the mean bond length as a function of composition x.

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