Dynamics of superstructure formation in intermetallic compounds

Kozubski, R.; Czekaj, S.; Kozłowski, Mirosław; Partyka, E.; Zapala, Kinga

doi:10.1016/j.jallcom.2003.11.168

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…It has now definitely been shown by means of Laplace transformation performed using an upgraded software. Former analysis by direct fits of functions (1) to the simulated curves lead to misinterpretations [21]. Both in Ni 3 Al and FePt the presence or absence of the fast relaxation component 4 was correlated with the character of the time evolution of APC (Figs.…”

Section: Results Of Computer Simulationsmentioning

confidence: 99%

“Order-order” relaxations in intermetallics

Kozubski¹,

Kozłowski²,

Pierron‐Bohnes³

et al. 2004

MEKU

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Order-order" relaxation processes in high-temperature intermetallics occur after an abrupt change of temperature and are controlled by atomic migration in the almost perfect superstructure. The related experiments were carried out using systems being of technological interest and representing three common types of superstructures: L1 2 (Ni 3 Albased quasi-binaries), L1 0 (FePd, FePt) and B2 (NiAl, FeAl). The corresponding Monte Carlo (MC) simulations of "order-order" kinetics involving the Glauber dynamics implemented with vacancy mechanism for atomic jumps were performed. The studies indicate a crucial role of antisite-easy-diffusion channels offered by particular superstructures in determining the character of "order-order" processes and their relationship to steady-state self-diffusion. Specific mechanisms of the relaxations in triple-defect B2-ordered binaries are discussed.

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Section: Results Of Computer Simulationsmentioning

confidence: 99%

“Order-order” relaxations in intermetallics

Kozubski¹,

Kozłowski²,

Pierron‐Bohnes³

et al. 2004

MEKU

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show abstract

“…The corresponding experimental studies performed by the present authors covered binary systems representing three common types of cubic/tetragonal superstructures: Ni 3 Al (L1 2 -type superstructure) [1], NiAl (B2-type superstructure) [2], FePd and FePt (both in L1 0 -type suprerstructure) [3,4]. The choice of the particular intermetallics was due to their technological importance: high-temperature refractoriness (Ni 3 Al and NiAl) and applicability as magnetic recording media (FePd and FePt).…”

Section: Energy Of a Systemmentioning

confidence: 99%

Atomic Migration as a Mechanism of Superstructure Formation in Intermetallic Compounds

Kozubski¹,

Kozłowski

Czekaj³

et al. 2005

DDF

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“Order-order” relaxations driven by atomic migration in superstructures proceed in nonsteady- state of a system, which relaxes to the equilibrium atomic configuration. Hence, the corresponding studies are complementary to standard steady-state diffusion investigations. Two time scales operating in “order-order” relaxations in L12-ordered (Ni3Al) and L10-ordered (FePd, FePt) binary intermetallics were experimentally observed. On the other hand, in B2-ordered NiAl – known of a giant vacancy concentration, “order-order” relaxations appeared surprisingly slow. Definite relationships between the activation energies for diffusion ( ) D A E and “order-order” relaxations ( ) O O A E − were revealed: ( ) D A E < ( ) O O A E − in L12-type superstructure; ( ) D A E ³ ( ) O O A E − in L10- and in B2-type superstructures. Corresponding simulation studies elucidated the specific atomistic mechanism of the processes. It has been shown that different time scales active in “order-order” relaxations in L12 and L10-ordered systems follow from specific atomic-jump correlations, which result from non-steady-state conditions and particular superlattice geometries: the availability of easy diffusion channels. A model of “order-order” kinetics in NiAl as controlled by a triple-defect mechanism is proposed.

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“…In this respect, the Monte-Carlo (MC) method is one of the effective methods for the phase transition analysis in metallic nanosystems and is proved to be efficient for calculation of equilibrium properties of systems, estimation of the phase stability limits, etc [2].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their unique behaviour, metallic nanoparticles are the subject of fundamental and applied works [1][2][3][4]. Nanoparticles are not always uniform.…”

Section: Introductionmentioning

confidence: 99%

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Size-Induced Freezing Effect in Monte-Carlo Simulations of Phase Separation Kinetics in Nanoparticles

Shirinyan

Lubyanskyy

2008

DDF

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The separation kinetics in a binary nanoparticle is studied by means of two-dimensional Monte-Carlo sampling and Ising-type model, where the species exchange positions due to vacancy mechanism. The model is developed in case of a free nanoparticle with a coating shell. The kinetics is shown to depend on the size of a nanosystem. We demonstrate a distinct size-induced freezing effect on kinetics of separation.

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Dynamics of superstructure formation in intermetallic compounds

Cited by 7 publications

References 16 publications

“Order-order” relaxations in intermetallics

“Order-order” relaxations in intermetallics

Atomic Migration as a Mechanism of Superstructure Formation in Intermetallic Compounds

Size-Induced Freezing Effect in Monte-Carlo Simulations of Phase Separation Kinetics in Nanoparticles

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