Temperature behavior of tracer diffusion in amorphous materials: A random-walk approach

1990 ◽  
Vol 65 (1) ◽  
pp. 60-63 ◽  
Author(s):  
Y. Limoge ◽  
J. L. Bocquet
Keyword(s):  
Random Walk ◽  
Amorphous Materials ◽  
Tracer Diffusion ◽  
Temperature Behavior

Recombination in amorphous materials as a continuous-time random-walk problem

1983 ◽  
Vol 27 (6) ◽  
pp. 3429-3435 ◽  
Author(s):  
A. Blumen ◽  
J. Klafter ◽  
G. Zumofen
Keyword(s):  
Random Walk ◽  
Continuous Time ◽  
Amorphous Materials ◽  
Continuous Time Random Walk

RANDOM WALK IN AMORPHOUS MATERIALS

1991 ◽  
Vol 05 (12) ◽  
pp. 799-803
Author(s):  
Y. LIMOGE ◽  
J. L. BOCQUET
Keyword(s):  
Random Walk ◽  
Mass Transport ◽  
Amorphous Materials ◽  
Crystalline Materials ◽  
Random Models ◽  
Diffusion Properties

Among the properties of non-crystalline materials one of the least understood is the mass transport. Depending on the measurement which is done the transport appears either as gaussian or dispersive. We show in this paper that the key point for the understanding of diffusion properties lies in a proper introduction of both aspects of disorder, site and saddle, in random models.

Temperature behavior of tracer diffusion on heterogeneous surfaces

1993 ◽  
Vol 295 (3) ◽  
pp. A704
Author(s):  
K. Sapag ◽  
V. Pereyra ◽  
J.L. Riccardo ◽  
G. Zgrablich
Keyword(s):  
Tracer Diffusion ◽  
Temperature Behavior ◽  
Heterogeneous Surfaces

Correlated random walk in lattices: Tracer diffusion at general concentration

1983 ◽  
Vol 27 (2) ◽  
pp. 844-857 ◽  
Author(s):  
R. A. Tahir-Kheli ◽  
R. J. Elliott
Keyword(s):  
Random Walk ◽  
Tracer Diffusion ◽  
Correlated Random Walk

Temperature behavior of tracer diffusion on heterogeneous surfaces

1993 ◽  
Vol 295 (3) ◽  
pp. 433-444 ◽  
Author(s):  
K. Sapag ◽  
V. Pereyra ◽  
J.L. Riccardo ◽  
G. Zgrablich
Keyword(s):  
Tracer Diffusion ◽  
Temperature Behavior ◽  
Heterogeneous Surfaces

Correlated random walk on lattices: Tracer diffusion in one dimension

1983 ◽  
Vol 27 (12) ◽  
pp. 7759-7762 ◽  
Author(s):  
R. A. Tahir-Kheli ◽  
Nagwa El-Meshad
Keyword(s):  
Random Walk ◽  
Tracer Diffusion ◽  
One Dimension ◽  
Correlated Random Walk

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

TEM studies of amorphization processes and amorphous structures

1988 ◽  
Vol 46 ◽  
pp. 448-449
Author(s):  
T. E. Mitchell ◽  
R. B. Schwarz
Keyword(s):  
Amorphous Materials ◽  
Fission Products ◽  
Rapid Quenching ◽  
Surface Films ◽  
List Type ◽  
Oxide Glasses ◽  
Crystalline Materials ◽  
Amorphous Structures ◽  
Amorphous Surface ◽  
Interfacial Films

Traditional oxide glasses occur naturally as obsidian and can be made easily by suitable cooling histories. In the past 30 years, a variety of techniques have been discovered which amorphize normally crystalline materials such as metals. These include [1-3]:Rapid quenching from the vapor phase.Rapid quenching from the liquid phase.Electrodeposition of certain alloys, e.g. Fe-P.Oxidation of crystals to produce amorphous surface oxide layers.Interdiffusion of two pure crystalline metals.Hydrogen-induced vitrification of an intermetal1ic.Mechanical alloying and ball-milling of intermetal lie compounds.Irradiation processes of all kinds using ions, electrons, neutrons, and fission products.We offer here some general comments on the use of TEM to study these materials and give some particular examples of such studies.Thin specimens can be prepared from bulk homogeneous materials in the usual way. Most often, however, amorphous materials are in the form of surface films or interfacial films with different chemistry from the substrates.

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