SECONDARY PROCESS OF RADIATION DAMAGE IN HALIDESAn heterogeneous nucleation model for the irradiation coloring of alkali halides

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-341-C6-343 ◽  
Author(s):  
M. Aguilar ◽  
F. Jaque ◽  
F. Agulló-López
Keyword(s):  
Radiation Damage ◽  
Heterogeneous Nucleation ◽  
Alkali Halides ◽  
Secondary Process ◽  
Nucleation Model

The Origin and Implications of (111)-Textured Grains Obtained via Nucleation and Growth of Solids in Pulsed-Laser-Quenched Al Films on SiO2

2006 ◽  
Vol 979 ◽  
Author(s):  
J. B. Choi ◽  
Min H. Choi ◽  
U.-J. Chung ◽  
A. B. Limanov ◽  
James S. Im
Keyword(s):  
Energy Density ◽  
Laser Irradiation ◽  
Heterogeneous Nucleation ◽  
Microstructural Analysis ◽  
Pulsed Laser ◽  
Nucleation And Growth ◽  
Nucleation Model ◽  
Wide Energy ◽  
Excimer Laser Irradiation ◽  
Condensed Systems

AbstractWe have investigated excimer laser irradiation of 2000-Å-thin as-deposited Al films on SiO2. Microstructural analysis of the irradiated films conducted with AFM and EBSD techniques reveals that there exists a wide energy density interval over which large equaxed grains with a strong (111) texture are obtained. Based on thermal, transformational, and microstructural considerations, we propose a heterogeneous nucleation model to account for the observed behaviors, and discuss the implication of the model on the phenomenon of heterogeneous nucleation of crystalline solids in condensed systems as regards the thermodynamic role played by the orientation of subcritical clusters.

scholarly journals The enhancement and suppression of immersion mode heterogeneous ice-nucleation by solutes

2018 ◽  
Vol 9 (17) ◽  
pp. 4142-4151 ◽  
Author(s):  
Thomas F. Whale ◽  
Mark A. Holden ◽  
Theodore W. Wilson ◽  
Daniel O'Sullivan ◽  
Benjamin J. Murray
Keyword(s):  
Liquid Water ◽  
Heterogeneous Nucleation ◽  
Alkali Halides ◽  
Supercooled Liquid ◽  
Ice Nucleation ◽  
Ammonium Salts ◽  
Atmospherically Relevant ◽  
Heterogeneous Ice Nucleation

Heterogeneous nucleation of ice from supercooled liquid water by some atmospherically relevant nucleators is enhanced by ammonium salts and suppressed by alkali halides.

Dynamics of Radiation Damage in Face-Centered-Cubic Alkali Halides

1967 ◽  
Vol 159 (3) ◽  
pp. 671-682 ◽  
Author(s):  
Ian McC. Torrens ◽  
Lewis T. Chadderton
Keyword(s):  
Radiation Damage ◽  
Alkali Halides ◽  
Face Centered Cubic ◽  
Face Centered

Radiation Damage Products in Ionic Crystals Impurity Doped Alkali Halides

1977 ◽  
Vol 25 (1-12) ◽  
pp. 511-578 ◽  
Author(s):  
S. Radhakrishna ◽  
B. V. R. Chowdari
Keyword(s):  
Radiation Damage ◽  
Alkali Halides ◽  
Ionic Crystals ◽  
Impurity Doped

The Initial Stages of Silicide Epitaxy - Nucleation and Morphology

1987 ◽  
Vol 94 ◽  
Author(s):  
R. J. Nemanich ◽  
C. M. Doland ◽  
F. A. Ponce
Keyword(s):  
Heterogeneous Nucleation ◽  
Cluster Size ◽  
Critical Thickness ◽  
Nucleation And Growth ◽  
Silicide Formation ◽  
Initial Thickness ◽  
Critical Cluster ◽  
Compound Formation ◽  
Nucleation Model ◽  
Metal Overlayers

ABSTRACTThe initial stages of epitaxial silicide formation are described in terms of the nucleation properties. The reaction process is divided into the stages of interdiffusion, nucleation, and growth and coalescence. The aspects of the nucleation from the interdiffused regions are described. Results are presented for Pd and Pt deposited on clean Si surfaces. The initial thickness where silicide compound formation is observed is related to he critical cluster size of the nucleation model. The epitaxial morphology can be strongly influenced by heterogeneous nucleation involving the substrate interface, and this effect is demonstrated by reaction with metal overlayers less than the critical thickness.

scholarly journals Technical Note: The heterogeneous Zeldovich factor

2007 ◽  
Vol 7 (2) ◽  
pp. 309-313 ◽  
Author(s):  
H. Vehkamäki ◽  
A. Määttänen ◽  
A. Lauri ◽  
I. Napari ◽  
M. Kulmala
Keyword(s):  
Surface Area ◽  
Heterogeneous Nucleation ◽  
Technical Note ◽  
Exact Form ◽  
Cluster Surface ◽  
Nucleation Model

Abstract. In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface approximations, which have been used in our earlier heterogeneous nucleation model and elsewhere in the literature. We also test the significance of widely used approximations for cluster surface area and circumference. We conclude that the approximations do not affect the predicted onset saturation. Especially for small pre-existing particles the nucleation rates calculated with the exact and approximative models differ significantly.

scholarly journals A Two-accelerator Facility and Its Use for Radiation Damage Studies in Alkali Halides

1980 ◽  
Vol 33 (3) ◽  
pp. 549
Author(s):  
CS Newton ◽  
HJ Hay
Keyword(s):  
Radiation Damage ◽  
Simultaneous Detection ◽  
Experimental Studies ◽  
Target Material ◽  
Experimental System ◽  
Alkali Halides ◽  
Damage Mechanism ◽  
X Rays ◽  
Accelerator Facility ◽  
Light Ions

An experimental system is described in which heavy ions of energies 50-100 MeV, and light ions of energies 0�5-2 MeV, may be transported alternatively from different accelerators into a common scattering chamber. Details are given of the beam transport and ~ttering chamber, the latter being designed to make in-beam studies of different modes of radiation damage in the target material. An on-line experimental control and data acquisition system with an IBM 1800 computer is used. Experimental studies are described of simultaneous detection of backscattered helium ions, X-rays and optical absorption in single-crystal alkali halide samples, performed during continuous irradiation by a 1 MeV helium beam, as well as of backscattered protons following intermittent irradiation by a 60 MeV oxygen beam. Analysis of the relative damage by these two beams is discussed in relation to a damage mechanism due to Pooley.

scholarly journals Technical note: The heterogeneous Zeldovich factor

2006 ◽  
Vol 6 (5) ◽  
pp. 9069-9083 ◽  
Author(s):  
H. Vehkamäki, ◽  
A. Määttänen, ◽  
A. Lauri ◽  
I. Napari ◽  
M. Kulmala
Keyword(s):  
Surface Area ◽  
Heterogeneous Nucleation ◽  
Technical Note ◽  
Exact Form ◽  
Cluster Surface ◽  
Nucleation Model

Abstract. In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface approximations, which have been used in our earlier heterogeneous nucleation model and elsewhere in the literature. We also test the significance of widely used approximations for cluster surface area and circumference. We conclude that the approximations do not affect the predicted onset saturation. Especially for small pre-existing particles the nucleation rates calculated with the exact and approximative models differ significantly.

scholarly journals Injection of Highly Supersaturated Oxygen Solutions Without Nucleation

2002 ◽  
Vol 124 (6) ◽  
pp. 676-683 ◽  
Author(s):  
J. Creech ◽  
V. Divino ◽  
W. Patterson ◽  
P. J. Zalesky ◽  
C. E. Brennen
Keyword(s):  
Heterogeneous Nucleation ◽  
High Speed ◽  
Aqueous Environment ◽  
Interior Surface ◽  
Heart Attacks ◽  
High Speed Video ◽  
Surprising Effect ◽  
Therapeutic Value ◽  
Video Observations ◽  
Nucleation Model

It is possible to inject highly supersaturated aqueous solutions of gas through a small capillary into an aqueous environment without the formation of significant gas bubbles. Such a technique has considerable potential therapeutic value in the treatment, for example, of heart attacks and strokes. The present paper is the second in a series (see Brereton et al. 1) investigating the basic phenomenon behind this surprising effect. Recent experiments clearly demonstrate that the nucleation, when it does occur, results from heterogeneous nucleation on the interior surface of the distal end of the capillary. This paper describes the effects of the treatment of this interior surface on the nucleation processes and the results of high speed video observations of the phenomena. A heterogeneous nucleation model is presented which is in accord with the experimental observations.

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