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Low-temperature ion-beam mixing in metals

Kim, S.-J. and Nicolet, M-A. and Averback, R. S. and Peak, D. (1988) Low-temperature ion-beam mixing in metals. Physical Review B, 37 (1). pp. 38-49. ISSN 0163-1829. doi:10.1103/PhysRevB.37.38.

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A systematic study of ion-beam mixing of tracer impurities in thin metal films at low temperatures has been conducted. We have investigated the dependence of ion mixing on two matrix properties: atomic mass and cohesive energy. We have also studied the dependence of ion mixing on tracer impurity properties: its heat of mixing with the matrix and its thermal diffusivity in the matrix. The matrices investigated were thin films of C, Al, Ti, Fe, Ni, Cu, Mo, Ru, Ag, Hf, Ta, W, Pt, and Au. The tracer impurities, Al, Ti, Cr, Mn, Fe, Ni, Cu, Y, Nb, Mo, Ru, Ag, In, Sb, Hf, Ta, W, Pt, Au, and Bi, were deposited as ≤15 Å layers near the midplanes of the specimens. All the tracer and matrix elements, except C, were deposited sequentially, without breaking vacuum. The samples were irradiated with 300–1000-keV Kr ions to doses 1015–1016 ions/cm2 at temperatures of 6 and/or 77 K. Most samples were analyzed at the irradiation temperature by He backscattering. A strong correlation between ion mixing and the matrix properties, atomic mass, and cohesive energy, was observed. A correlation between ion mixing and tracer impurity diffusion was also observed but not between ion mixing and the heat of mixing or relative mass of the impurity with the matrix. The results are interpreted within the framework of a thermal spike model of cascade diffusion.

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Additional Information:©1988 The American Physical Society Received 7 November 1986 We are grateful to Mr. P. Baldo, L. J. Thompson, and J. Wallace at Argonne Natioanl Laboratory (ANL), and Mr. A. Ghaffari at Caltech for technical assistance. We are also grateful to Dr. B. M. Paine for helpful discussions. One of us (R.S.A.) is grateful to his co-workers, Dr. R. Benedek and Mr. T. Diaz de la Rubia, for use of as-yet-unpublished molecular-dynamics studies, and also their stimulating discussions. This work was supported by the U.S. Office of Naval Research under contract No. N00014-84-K-0275 and at ANL and the University of Illinois at Urbana-Champaign by the U.S. Departments of Energy Division of Basic Energy Sciences - Materials Sciences under Contracts No. W-31-109-Eng-38 and No. DE-AC02-76ER01198, respectively.
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Deposited On:03 Sep 2006
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