Segregation and phase separation in thin films

Cserháti, Cs.; Szabó, I.A.; Beke, D.L.

doi:10.1016/s0965-9773(98)00061-0

Cited by 4 publications

(7 citation statements)

References 8 publications

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“…al. [1], we choose E i,i+1 as the activation energy required to break the nearest neighbour bonds of A atom in layer i and of a B atom in layer (i+1) and to bring atoms into the saddle point position with a fixed energy E 0 :…”

Section: Basic Equationsmentioning

confidence: 99%

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Kinetics of Surface Segregation and Phase Separation in Nanostructures

Erdélyi

Beke

Cserháti

et al. 2003

DDF

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Phase separating AB alloy systems can be divided into two groups: strongly and weakly segregating binary alloys. In a strongly segregating system desegregation can never be established, whereas in weakly segregation system, both segregation and desegregation can occur depending on the overall composition of the system. In order to get information about the time evolution of a slab, we used a numerical solution of Martin's deterministic kinetic equations. In case of strongly segregating spinodal systems an interesting interplay between surface segregation, spinodal decomposition and phase separation has been found. Furthermore, the effect of the slab thickness (d) was investigated and the change of the solubility as a function of d has been studied. In case of weakly segregating spinodal systems also a segregation of A atoms starts at the surface first and the segregation generated spinodal wave is also developed (A/B…B/A morphology). Later on, the surface structure makes a sudden "reversal". This means that a morphology B/A…A/B develops with a small segregation of A atoms on the surfaces of the B-rich phase. The observed surface reversal is an inherent property of the weakly segregating system and the characteristic time evolution of the surface concentration is observable experimentally in thin film samples.

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Section: Basic Equationsmentioning

confidence: 99%

“…Phase separating AB alloy systems can be divided into two groups: strongly and weakly segregating binary alloys [1]. In weakly segregating systems there is a critical concentration (c h ), which separates the segregating (if c < c h ) and desegregating (if c > c h ) regions in the phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Surface Segregation and Phase Separation in Nanostructures

Erdélyi

Beke

Cserháti

et al. 2003

DDF

Self Cite

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“…From the equation of the surface segregation isotherm it is easy to show [104] that there exists a certain bulk composition so that for bulk compositions of B atoms, smaller than there is a segregation and for there is a desegregation. Accordingly, if the system is weakly segregating, while in the opposite case we speak about a strongly segregating system (because now only segregation of B atoms occurs at any bulk composition:…”

Section: Segregation Kineticsmentioning

confidence: 99%

Diffusion in Nanomaterials

Bernardini

Beke

2002

Nanocrystalline Metals and Oxides

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“…The SGF doped with Cr or Fe oxides were homogeneous with depth for all investigated concentrations (up to 50 wt% metal nitrates in sol). According to [16] the SGFs doped with Mn or Ni and Cu or Co can be referred to as weakly and strongly segregating systems, respectively. We noted that the amount of silicon atoms is very small on the surface of the Co doped films (table 1).…”

Section: The Surface Segregation Revealed By Rbsmentioning

confidence: 99%

Surface segregation of transition metals in sol-gel silica films

Prokopenko

Гурин

Alexeenko

et al. 2000

J. Phys. D: Appl. Phys.

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Silica sol-gel films (SGFs) doped with various transition metals derived by spin-coating on glass substrates and silicon wafers have been studied. Precursor solutions were prepared by mixing tetraethylorthosilicate, ethanol, water and nitrates of the transition metals (Cr, Mn, Fe, Co, Ni and Cu) using HCl as a catalyst. Remarkable segregation of metals at the surface was observed for films doped with Cu and Co. For Mn- and Ni-doped films this effect was much less, and it vanished for the films doped with Cr or Fe. The influence of boron and phosphorus upon the chemical state and the distribution of metal atoms was also analysed. The structure, optical properties and composition of the SGFs were studied and some pathways to control the dopant segregation effect were realized.

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Segregation and phase separation in thin films

Cited by 4 publications

References 8 publications

Kinetics of Surface Segregation and Phase Separation in Nanostructures

Kinetics of Surface Segregation and Phase Separation in Nanostructures

Diffusion in Nanomaterials

Surface segregation of transition metals in sol-gel silica films

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