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- W2315968792 abstract "The weak concentration dependence of Ni diffusivity in NiGa has formerly been interpreted as evidence for Ni diffusion via next-nearest-neighbor jumps, which seems reasonable in the light of the comparably high enthalpy of formation found in this alloy. Quasielastic neutron scattering (QNS) at the backscattering spectrometer IN16 at ILL has been used to study the elementary diffusion jump of Ni in NiGa single crystals near the stoichiometric composition ${mathrm{Ni}}_{50}{mathrm{Ga}}_{50}$ as well as in polycrystals with $57 mathrm{at}.% mathrm{Ni}$ and $62 mathrm{at}.% mathrm{Ni}.$ While the weak concentration dependence of the Ni diffusion coefficient has been confirmed over a wide concentration range on the Ni-rich site of the NiGa phase diagram, the diffusive jump of Ni atoms unequivocally turned out to be a jump via nearest-neighbor sites, i.e., antistructure sites. For the near-stoichiometric compositions it was possible to determine the residence time of the Ni atoms on the antistructure sites directly from the QNS measurements. These results indicate very high defect concentrations near the melting temperature." @default.
- W2315968792 created "2016-06-24" @default.
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- W2315968792 date "2000-05-01" @default.
- W2315968792 modified "2023-10-18" @default.
- W2315968792 title "Nickel diffusion in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>B</mml:mi><mml:mn>2</mml:mn><mml:mn /><mml:mo>−</mml:mo><mml:mi mathvariant=normal>NiGa</mml:mi></mml:math>studied with quasielastic neutron scattering" @default.
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- W2315968792 doi "https://doi.org/10.1103/physrevb.61.12038" @default.
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