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001-es BibID:	BIBFORM008875
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	On the determination of the equilibrium surface segregation isotherms form kinetic measurements / Z. Erdélyi, A. Taranovskyy, D. L. Beke
Dátum:	2009
ISSN:	1606-5131
Megjegyzések:	Thirty years ago, Lagues and Domange [1] studying dissolution and segregation kinetics, introduced the s urface local equilibrium hypothesis. This hypothesis is based on the idea that the kinetics (diffusion) is faster in the near surface region (selvedge) than in the bulk and thus it can be assumed that the atoms just below the selvedge can be in equilibrium with the atoms of the deposit. In this contribution, based on our recent work [2], using three dimensional kinetic Monte Carlo (KMC) and one dimensional kinetic mean filed (KMF) models, we show that the local equilibrium can be violated even in simple cases when complex surface phenomena (defects, relaxation, size effects, etc.) are not taken into account. Furthermore we illustrate that, even if the above hypothesis is obeyed, the determination of the surface segregation isotherms from kinetics can lead to uncertain result because of the restricted validity of Fick's first equation on the nanoscale.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Reviews on Advanced Materials Science . - 21 : 1 (2009), p. 6-17. -
További szerzők:	Taranovskyy, Andriy Beke Dezső László (1945-) (fizikus)
Internet cím:	elektronikus változat
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001-es BibID:	BIBFORM005354
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	Dissolution and off-stoichiometric formation of compound layers in solid state reactions / Zoltán Erdélyi, Dezső L. Beke, Andriy Taranovskyy
Dátum:	2008
Megjegyzések:	In many technological processes, intermediate phases are produced by solid state reactions (SSRs) of pure materials initially layered onto each other. It is generally accepted that during heat treatments of such structures, stoichiometric compound films form and then grow, or if such a layer already exists then it growths further. We show that in many realistic cases the compound layer forms and starts to grow highly off stoichiometrically. Moreover, an initially existing stoichiometric compound layer may dissolve then off stoichiometrically reform. Our findings are of primary importance for nanotechnologies where early stages of SSR are utilized; e.g., metallization for silicon-baseddevices in micro-/nanoelectronics.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Applied Physics Letters. - 92 : 13 (2008), p. 133110-1 - 133110-2. -
További szerzők:	Beke Dezső László (1945-) (fizikus) Taranovskyy, Andriy
Internet cím:	elektronikus változat Szerző által megadott URL DOI
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001-es BibID:	BIBFORM004316
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	On the determination of the equilibrium surface segregation isotherms form kinetic measurements / Z. Erdélyi, A. Taranovskyy, D. L. Beke
Dátum:	2008
Megjegyzések:	Thirty years ago, Lagues and Domange [M. Lagues, J.L. Domange, Surf. Sci. 47 (1975) 77] studying dissolution and segregation kinetics, introduced the surface local equilibrium hypothesis. This hypothesis is based on the idea that the kinetics (diffusion) is faster in the near surface region (selvedge) than in the bulk and thus it can be assumed that the atoms just below the selvedge can be in equilibrium with the atoms of the deposit. Later on numerous articles have dealt with this problem and most of them have confirmed its validity, although the clear meaning of the selvedge and especially its thickness remained unspecified. In this paper, using one dimensional kinetic mean filed (KMF) and three dimensional kinetic Monte Carlo (KMC) models, we show that the local equilibrium can be violated even in simple cases when complex surface phenomena (defects, relaxation, size effects, etc.) are not taking into account. Furthermore we illustrate that, even if the above hypothesis is obeyed, the determination of the surface segregation isotherms from kinetics can lead to uncertain result because of the restricted validity of Fickas first equation on the nanoscale. At the same time we found that the selvedge is typically ends at the first or second subsurface layer.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Surface Science. - 602 : 3 (2008), p. 805-810. -
További szerzők:	Taranovskyy, Andriy Beke Dezső László (1945-) (fizikus)
Internet cím:	elektronikus változat
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001-es BibID:	BIBFORM002885
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	On the local equilibrium during dissolution of a thin film / Z. Erdélyi, A. Taranovskyy, D. L. Beke
Dátum:	2007
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Diffusion And Defect Data. - 264 (2007), p. 171-175. -
További szerzők:	Taranovskyy, Andriy Beke Dezső László (1945-) (fizikus)
Internet cím:	elektronikus változat
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