| Issue |
Europhys. Lett.
Volume 58, Number 2, April 2002
|
|
|---|---|---|
| Page(s) | 243 - 249 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00629-y | |
| Published online | 01 December 2003 | |
Long-range atomic order in irradiated 
1
Institut Laue-Langevin - 6 Rue Jules Horowitz, B.P. 156 X Grenoble Cedex 9, France
2
Victoria University of Technology - P.O. Box 14428, MCMC 8001,
Australia
3
ANSTO - PMB 1, Menai NSW, 2234, Australia
4
School of Science, Griffith University - Brisbane 4111, Australia
Received:
12
July
2001
Accepted:
25
January
2002
Atomic short-range order is commonly observed in
alloys via a diffuse (
) peak in
neutron diffraction patterns. There has been speculation for many
years on the existence and nature of any corresponding long-range
order. A sample of has been irradiated in a
high fast-neutron flux to produce a large number of crystal
defects at around room temperature and thus facilitate the
ordering process. Measurements of the diffuse neutron scattering
from this sample demonstrate that long-range order has been
induced in the sample, as evidenced by at least five Bragg peaks.
This order is not seen in a reference sample prepared in identical
fashion except for the irradiation. The Cowley short-range order
parameters for both samples are calculated and a candidate
structure for the long-range order is proposed.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 61.72.Ji – Point defects (vacancies, interstitials, color centers, etc.) and defect clusters / 61.80.Hg – Neutron radiation effects
© EDP Sciences, 2002
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