Relation between Ga ordering and magnetostriction of Fe-Ga alloys studied by x-ray diffuse scattering
- Ames
Transmission synchrotron diffraction was employed to characterize the Ga ordering in magnetostrictive Fe{sub 100-x}Ga{sub x} alloys with Ga concentrations from 0 to 20.3 at.%. The experiments focused on the development of atomic short-range ordering (SRO) by analysis of the diffuse scattering appearing at superlattice positions of the D0{sub 3} ordered alloy structure. No SRO was found for Ga concentrations less than 4 at. %. Between 13 and 20.3 at. %, D0{sub 3}-type SRO clusters are observed whose size increases with Ga concentration for both slow-cooled and quenched samples. Thermal quenching of the samples suppresses the cluster sizes when compared to slow-cooled samples of the same concentration. For quenched samples with large Ga concentration, Ga pairing is evidenced by growing B2-type correlations. At low concentrations, the presence of SRO appears to have little (if any) effect on the enhanced magnetostriction. However, the dramatic suppression of magnetostriction near {approx} 20 at. % Ga can be linked rapid growth of SRO just before the onset of long-range chemical order.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1002774
- Journal Information:
- Phys. Rev. B, Vol. 81, Issue (5) ; 02, 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
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