Open AccessLong-range atomic order in irradiated Cu 80 Mn 20
Author(s) -
L.D. Cussen,
Evan Gray,
A. P. Murani,
S. J. Kennedy,
B. A. Hunter
Publication year - 2002
Publication title -
epl (europhysics letters)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.625
H-Index - 165
eISSN - 1286-4854
pISSN - 0295-5075
DOI - 10.1209/epl/i2002-00629-y
Subject(s) - short range order , irradiation , range (aeronautics) , materials science , order (exchange) , physics , atomic physics , nuclear physics , condensed matter physics , business , composite material , finance
Atomic short-range order is commonly observed in _CuMn alloys via a diffuse (1 ) 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 Cu80Mn20 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.Full Tex
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