Mass and geometry effects on the anisotropic transport in ion mixing

Journal Article · Mon Feb 11 04:00:00 EST 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104595· OSTI ID:5863335

Auner, G W; Cheng, Y ^[1]; Alkaisi, M H; Padmanabhan, K R ^[2]

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1. Physical Chemistry Department, General Motors Research Laboratories, Warren, MI (USA)
2. Department of Physics and Astronomy, Wayne State University, Detroit, MI (USA)

Experimental investigations of the effect of target species atomic mass and system geometry on the anisotropic transport in the ion mixing of metallic systems are reported. Bilayer samples with zero heats of mixing and similar cohesive energies, but different atomic mass and geometry, such as Ta on top of Nb(Ta/Nb), Nb on top of Ta(Nb/Ta), Hf on top of Zr (Hf/Zr), and Zr on top of Hf(Zr/Hf) were irradiated by 300 keV Kr{sup 2+} at a dose of 2 {times} 10{sup 16} Kr{sup 2+}/cm{sup 2} at 77 K. The samples were investigated using embedded markers and Rutherford backscattering spectrometry. The experimental results indicate that the anisotropic transport is dominated by a preferential displacement of the top layer species into the bottom layer. This is probably due to an anisotropy in the momentum distribution within the collision cascade. In addition, there is an enhancement of the inward displacement when the lighter species is on top indicating a small preferential recoil displacement of the lighter species over the heavier one.

• OSTI ID: 5863335
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 58:6; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ATOM TRANSPORT
CHARGED PARTICLES
COLLISIONS
ELASTIC SCATTERING
ION COLLISIONS
ION IMPLANTATION
IONS
KRYPTON IONS
NEUTRAL-PARTICLE TRANSPORT
NIOBIUM ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION TRANSPORT
RUTHERFORD SCATTERING
SCATTERING
TANTALUM ALLOYS