Long-range atomic order in irradiated Cu80Mn20

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Author(s)
Cussen, LD
Gray, EM
Murani, AP
Kennedy, SJ
Hunter, BA
Griffith University Author(s)
Year published
2002
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Show full item recordAbstract
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 ...
View more >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.
View less >
View more >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.
View less >
Journal Title
Europhysics Letters
Volume
58
Issue
2
Copyright Statement
© 2002 EDP Sciences. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.
Subject
Mathematical sciences
Physical sciences