Neutron diffraction studies of magnetostrictive Fe–Ga alloy ribbons
Zhao, X, Mellors, NJ, Kilcoyne, SH, Lord, DG, Lupu, N, Horia , C and Henry, P 2008, 'Neutron diffraction studies of magnetostrictive Fe–Ga alloy ribbons' , Journal of Applied Physics, 103 (07B32) .
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Melt-spun Fe–Ga ribbons were prepared and some ribbons were annealed at 1000 °C for 1 h then slowly cooled to room temperature. X-ray diffraction patterns revealed no evidence of texture and only bcc phase in the as-quenched ribbons. However, high-resolution neutron diffraction patterns gave more information on the structure of these ribbons. Only diffractions from the disordered bcc A2 phase were found in as-quenched ribbons with 15, 17.5, and 19.5 at. % Ga content, without any trace of satellite peaks or splitting peaks from the proposed Ga–Ga pairing superlattice structure. The broadening of the base of the �110� peaks for all samples except the as-quenched 15 at. % Ga ribbon might indicate the existence of some kind of short range ordering. Ribbons developed L12 phase after annealing especially in the Fe 19.5 at. % Ga ribbon where the formation of L12 phase reduced the Ga content in the remaining A2 phase and decreased its lattice parameter dramatically. D03 phase formed in the as-quenched 22.5 at. % Ga ribbon and the following annealing treatment transformed more A2 phase into D03 phase.
|Themes:||Subjects outside of the University Themes|
|Schools:||Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre|
|Journal or Publication Title:||Journal of Applied Physics|
|Publisher:||American Institute of Physics|
|Depositing User:||NJ Mellors|
|Date Deposited:||20 Mar 2012 16:13|
|Last Modified:||20 Mar 2012 16:13|
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