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Metastable and transient states of chemical ordering in Fe-V nanocrystalline alloys

Ziller, T. and Le Caër, G. and Isnard, O. and Cénédèse, P. and Fultz, B. (2002) Metastable and transient states of chemical ordering in Fe-V nanocrystalline alloys. Physical Review B, 65 (2). Art. No. 024204. ISSN 0163-1829. doi:10.1103/PhysRevB.65.024204.

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Chemical ordering of the disordered alloys Fe0.78V0.22, Fe0.53V0.47, Fe0.39V0.61, and Fe0.37V0.63 was performed by annealing at temperatures from 723 to 973 K. The initial state of chemical disorder was produced by high-energy ball milling, and the evolution of order was measured by neutron diffractometry and by 57Fe Mössbauer spectrometry. The hyperfine magnetic field distributions obtained from the Mössbauer spectra provided quantitative measurements of the number of antisite Fe atoms in the partially ordered alloys. The long-range order parameters in steady state after long annealing times were used as states of metastable equilibrium for a generally successful comparison with the metastable Fe-V phase diagram calculated by Sanchez et al. [Phys. Rev. B 54, 8958 (1996)]. For the metastable equilibrium state of order in Fe0.53V0.47 at low temperatures, the order parameters were smaller than expected. This corresponded to an abundance of antisite atoms, which were not removed effectively by annealing at the lower temperatures.

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Fultz, B.0000-0002-6364-8782
Additional Information:© 2001 The American Physical Society Received 23 July 2001; published 19 December 2001 We thank Pierre Delcroix (LSG2M) and Bernard Malaman (Université Henri-Poincaré, Nancy) for their help with the measuring of Mössbauer spectra. We are indebted to the Institut Laue-Langevin (ILL, Grenoble) and to CNRS for the use of the DlB instrument operating as a Collaborative Research Group. B.F. acknowledges NSF Grant No. DMR-9816617.
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Deposited On:14 Mar 2006
Last Modified:08 Nov 2021 19:46

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