Kinetic phase diagram for island nucleation and growth during homoepitaxy

2008 ◽  
Vol 77 (7) ◽  
Author(s):  
P. A. Mulheran ◽  
M. Basham
Keyword(s):  
Phase Diagram ◽  
Nucleation And Growth ◽  
Island Nucleation

Role of boundaries in the crystallization of amorphous films

1988 ◽  
Vol 46 ◽  
pp. 626-627
Author(s):  
D. A. Smith
Keyword(s):  
Low Temperature ◽  
Amorphous State ◽  
Nucleation And Growth ◽  
Amorphous Films ◽  
Island Nucleation ◽  
Surface Steps ◽  
Transmission Electron ◽  
Component Systems ◽  
Temperature Deposition

The nucleation and growth processes which lead to the formation of a thin film are particularly amenable to investigation by transmission electron microscopy either in situ or subsequent to deposition. In situ studies have enabled the observation of island nucleation and growth, together with addition of atoms to surface steps. This paper is concerned with post-deposition crystallization of amorphous alloys. It will be argued that the processes occurring during low temperature deposition of one component systems are related but the evidence is mainly indirect. Amorphous films result when the deposition conditions such as low temperature or the presence of impurities (intentional or unintentional) preclude the atomic mobility necessary for crystallization. Representative examples of this behavior are CVD silicon grown below about 670°C, metalloids, such as antimony deposited at room temperature, binary alloys or compounds such as Cu-Ag or Cr O2, respectively. Elemental metals are not stable in the amorphous state.

scholarly journals Formation Procedure of Reaction Phases in Al Hot Dipping Process of Steel

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 820 ◽  
Author(s):  
Dongik Shin ◽  
Jeong-Yong Lee ◽  
Hoejun Heo ◽  
Chung-Yun Kang
Keyword(s):  
Phase Diagram ◽  
Steel Surface ◽  
Flow Direction ◽  
Nucleation And Growth ◽  
Boron Steel ◽  
Mechanism Of Reaction ◽  
Dipping Process ◽  
Fe4al13 Phase ◽  
Nucleation And Growth Mechanism ◽  
Dipping Time

This study investigated the nucleation and growth mechanism of reaction layers and phases of hot-dipped boron steel in pure Al at 690 °C for 0–120 s. In the case of a dipping time of 30 s, reaction nuclei of width 10–15 μm and height 10 μm were formed on the steel surface in the flow direction of the liquid Al. This reaction layer was formed as a mixture of θ (Fe4Al13) phase of several nm to 2 μm, θ and η (Fe2Al5) of several nm, a columnar η region, and a β (FeAl) region of 500 nm thickness at the steel interface. At the grain boundaries of ferrite, in contact with the η phase, κ (Fe3AlC) was formed. Using the calculated Fe-Al phase diagram, it was determined that when Fe was dissolved in liquid Al from the steel above 2.5 at% (0.6 wt%), the θ phase was formed. Although most of the θ phases continuously grew toward the liquid phase, the θ phase in contact with the steel was transformed into the η phase with minimal differences in composition due to the inter-diffusion of Al and Fe. It was therefore concluded that the η phase formed at the interface became a growth nucleus and grew in a columnar form toward the steel.

Island nucleation and growth during homoepitaxy on GaAs(001)-(2×4)

1999 ◽  
Vol 201-202 ◽  
pp. 56-61 ◽  
Author(s):  
D.D Vvedensky ◽  
M Itoh ◽  
G.R Bell ◽  
T.S Jones ◽  
B.A Joyce
Keyword(s):  
Nucleation And Growth ◽  
Island Nucleation

MONTE CARLO SIMULATION OF NUCLEATION AND GROWTH IN THE 3D NEAREST-NEIGHBOR ISING MODEL

2001 ◽  
Vol 12 (03) ◽  
pp. 345-359 ◽  
Author(s):  
JÜRN SCHMELZER ◽  
D. P. LANDAU
Keyword(s):  
Phase Diagram ◽  
Monte Carlo ◽  
Cluster Size ◽  
Nearest Neighbor ◽  
Ostwald Ripening ◽  
Nucleation And Growth ◽  
Size Distribution Function ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Regular Solutions

Monte Carlo simulations of nucleation and growth processes in an Ising-binary alloy model are presented. The evolution of the cluster size distribution function and its characteristic properties (mean radius and concentration of the clusters) has been investigated from the initial quench into the metastable region of the phase diagram until the establishment of the final equilibrium. All classical stages of nucleation and growth could be observed, the stages of steady-state nucleation, independent growth and Ostwald ripening. A quantitative analysis of the simulational results in terms of the theory of regular solutions shows the validity of classical nucleation theory in the region of the phase diagram considered and provides evidence for a size and structure dependent interfacial tension between the two newly formed phases.

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