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001-es BibID:	BIBFORM008679
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	"Surfactant-like dissolution" of a thin deposit for composition dependent diffusion coefficient / Z. Erdélyi, G.L. Katona, D.L. Beke
Dátum:	2005
ISSN:	1012-0386
Megjegyzések:	The dissolution of a few atomic layers thick deposit into a semi-infinite substrate in phase separating systems was investigated recently (e.g. [1]) by computer simulations. It was found that if the substrate atoms have the tendency for surface segregation, there exists a critical temperature (T-k) below which the dissolution takes place layer-by-layer at the deposit-substrate interface but only until the moving interface reaches the subsurface layer. Here the remaining two deposit layers are immersed in the substrate due to the segregation tendency. It is worth noting that the moving interface obeys the parabolic law, i.e. shifts proportionally with the square root of the time. Whereas, in case of T > T-k, in spite of a relatively thick deposit, the segregation leads to a rapid enrichment of the surface by the substrate atoms and thus to burying of the almost intact deposit film. Then, two simultaneous layer-by-layer dissolution modes take place and compete with each other: from the top and from the bottom of the deposit (surfactant-like dissolution). In the above calculations the tracer diffusion coefficients were considered composition independent. Here, we will treat the influence of the composition dependence of the diffusion coefficient [2, 3] on the surfactant-like dissolution and the time dependence of the interface shift. In case of composition dependent diffusion coefficient, depending on its strength, the previously observed surfactant-like dissolution mode can disappear [4] and the time dependence of the interface shift can differ from the parabolic law [5]. Furthermore, from the analysis of different possible dissolution modes of nanocrystalline thin films into single crystalline substrates, we conclude that the surfactant mode can hardly be observed experimentally.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Defect and Diffusion Forum. - 237-240 (2005), p. 537-542. -
További szerzők:	Katona Gábor (1977-) (fizikus) Beke Dezső László (1945-) (fizikus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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