TY - JOUR
T1 - Influence of thermochemical properties on ion mixing of markers in Cu and β-Zr at 77 K with Kr
AU - Kim, S. J.
AU - Nicolet, M. A.
AU - Averback, R. S.
N1 - Funding Information:
We are grateful to P. Baldo, L.J. Thompson and A. Taylor at Argonne National Laboratory and R. Gorris and D. Groseth at Caltech for technical assistance. This work was supported at Caltech by the Office of Naval Research under contract no. N00014-84-K-0275 and at Argonne National Laboratory by the Department of Energy, BES-Materials Sciences, under contract no. W-31-109-Eng-38.
PY - 1987
Y1 - 1987
N2 - Ion mixing of Nb, Ru, Ag, In, Sb, Hf, Pt, Au, and Bi markers in a Cu matrix and of Ti, Cr, Fe, Co, Ni, Cu, Hf, W, and Au markers in a β-Zr matrix has been studied by irradiation with 750 keV Kr+ ions of doses from 5 × 1015 to 2 × 1016/cm2= at 77 K. Cu and β-Zr have quite different atomic properties and impurities in them also behave quite differently. Thus, through a systematic investigation, the influence of parameters and mechanisms on ion mixing is clarified. The mixing was analyzed in situ, using 1.8 and 1.9 MeV He ion backscattering spectrometry. The overall mixing efficiency, Dt/φFD, is significantly higher in Cu than in β-Zr. This difference is explained in terms of the thermal spike mechanism in these matrices. In Cu, the mixing efficiencies correlate with impurity tracer diffusivities and impurity-vacancy binding energies for the marker atoms in Cu. Vacancies apparently play a major role during thermal spike mixing in Cu. In β-Zr, the markers that are likely to dissolve substitutionally in the matrix, have slightly higher mixing efficiencies than the markers that are likely to dissolve interstitially. The results are interpreted with the diffusion properties of these impurities in β-Zr.
AB - Ion mixing of Nb, Ru, Ag, In, Sb, Hf, Pt, Au, and Bi markers in a Cu matrix and of Ti, Cr, Fe, Co, Ni, Cu, Hf, W, and Au markers in a β-Zr matrix has been studied by irradiation with 750 keV Kr+ ions of doses from 5 × 1015 to 2 × 1016/cm2= at 77 K. Cu and β-Zr have quite different atomic properties and impurities in them also behave quite differently. Thus, through a systematic investigation, the influence of parameters and mechanisms on ion mixing is clarified. The mixing was analyzed in situ, using 1.8 and 1.9 MeV He ion backscattering spectrometry. The overall mixing efficiency, Dt/φFD, is significantly higher in Cu than in β-Zr. This difference is explained in terms of the thermal spike mechanism in these matrices. In Cu, the mixing efficiencies correlate with impurity tracer diffusivities and impurity-vacancy binding energies for the marker atoms in Cu. Vacancies apparently play a major role during thermal spike mixing in Cu. In β-Zr, the markers that are likely to dissolve substitutionally in the matrix, have slightly higher mixing efficiencies than the markers that are likely to dissolve interstitially. The results are interpreted with the diffusion properties of these impurities in β-Zr.
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U2 - 10.1016/S0168-583X(87)80133-7
DO - 10.1016/S0168-583X(87)80133-7
M3 - Article
AN - SCOPUS:0022962286
VL - 19-20
SP - 662
EP - 668
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - PART 2
ER -