Investigation of kinetics of polymorphous transformations in some molecular crystals

1996 ◽  
Vol 63 (6) ◽  
pp. 786-789
Author(s):  
L. S. Bezhanova ◽  
A. Ts. Sarkisvan ◽  
S. M. Yailoyan
Keyword(s):  
Molecular Crystals ◽  
Kinetics Of ◽  
Polymorphous Transformations

Sublimation kinetics of organic molecular crystals

1981 ◽  
Vol 55 (2) ◽  
pp. 351-362 ◽  
Author(s):  
H.K. Cammenga ◽  
H.-J. Petrick ◽  
F.W. Schulze
Keyword(s):  
Molecular Crystals ◽  
Organic Molecular Crystals ◽  
Sublimation Kinetics ◽  
Kinetics Of

Kinetics of ice nucleation initiated by molecular crystals

1995 ◽  
Vol 30 (6) ◽  
pp. 282-285
Author(s):  
V. K. Yatsimirskii ◽  
V. L. Budarin ◽  
L. P. Oleksenko
Keyword(s):  
Molecular Crystals ◽  
Ice Nucleation ◽  
Kinetics Of

Kinetics of Polymorphous Transformations of Anodic Alumina

1974 ◽  
Vol 9 (8) ◽  
pp. 913-919 ◽  
Author(s):  
N. N. Sirota ◽  
G. N. Shokhina
Keyword(s):  
Anodic Alumina ◽  
Kinetics Of ◽  
Polymorphous Transformations

Kinetics of direct and reverse polymorphic transformations in molecular crystals of energetic compounds

2016 ◽  
Vol 65 (1) ◽  
pp. 91-97
Author(s):  
V. V. Zakharov ◽  
N. V. Chukanov ◽  
A. D. Chervonnyi ◽  
S. V. Vozchikova ◽  
B. L. Korsunskii ◽  
...  
Keyword(s):  
Molecular Crystals ◽  
Energetic Compounds ◽  
Polymorphic Transformations ◽  
Kinetics Of

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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