On the Kinetics of Elementary Processes of Pressure Solution

1998 ◽  
Vol 152 (4) ◽  
pp. 667-683 ◽  
Author(s):  
V. Kruzhanov ◽  
B. Stöckhert
Keyword(s):  
Pressure Solution ◽  
Elementary Processes ◽  
Kinetics Of

Kinetic study by controlled-transformation rate thermal analysis of the dehydroxylation of kaolinite

Clay Minerals ◽  
1998 ◽  
Vol 33 (2) ◽  
pp. 269-276 ◽  
Author(s):  
P. Dion ◽  
J.-F. Alcover ◽  
F. Bergaya ◽  
A. Ortega ◽  
P. L. Llewellyn ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Vapour Pressure ◽  
Reaction Rate ◽  
Diffusion Mechanism ◽  
Transformation Rate ◽  
Elementary Processes ◽  
Precise Control ◽  
First Order ◽  
Temperature And Pressure ◽  
Kinetics Of

AbstractAlthough the kinetics of the dehydroxylation of kaolinite have been widely studied, there is no definitive explanation of its mechanism due to its dependence on a variety of parameters. In this study, the dehydroxylation of kaolinite has been studied using controlled-transformation rate thermal analysis (CRTA), allowing precise control of the reaction rate, and thus of both the temperature and pressure above the sample. Modelling of the experimental results obtained by CRTA as well as those from TEM and MAS-NMR show that two elementary processes (diffusion and firstorder) can occur in competition. At the start of the decomposition the diffusion mechanism is predominant, but as the reaction progresses, the first-order mechanism prevails. It would seem that the importance of each process depends, in particular, on the presence of defects as well as on the local vapour pressure.

Elementary processes and kinetics of H2plasmas for different technological applications

2002 ◽  
Vol 11 (3A) ◽  
pp. A7-A25 ◽  
Author(s):  
M Capitelli ◽  
R Celiberto ◽  
F Esposito ◽  
A Laricchiuta ◽  
K Hassouni ◽  
...  
Keyword(s):  
Elementary Processes ◽  
Kinetics Of

A Discussion on natural strain and geological structure - The kinetics of rock deformation by pressure solution

1976 ◽  
Vol 283 (1312) ◽  
pp. 203-219 ◽  
Keyword(s):  
Grain Boundary ◽  
Geological Structure ◽  
Deformation Mechanisms ◽  
Rock Deformation ◽  
Pressure Solution ◽  
Mineral Solubility ◽  
Diffusive Mass Transfer ◽  
Diffusive Flow ◽  
Kinetics Of ◽  
Coble Creep

A simple model for rock deformation by pressure solution, assuming grain boundary diffusive mass transfer to be deformation rate controlling, is presented. The model leads to a constitutive flow law which is of the same form as that for Coble creep. It is argued that the presence of a fluid film in stressed grain boundaries leads to enhanced diffusivity of solute particles in the grain boundary. Some simple experiments are described, which demonstrate rapid diffusion in solutions in pores, much slower diffusion in stressed interfaces and deformation by pressure solution. By using the theoretical model, and by assuming that the pressure of the interfacial solution is equal to the applied normal stress, so that available experimental data on the effect of pressure on mineral solubility could be used, rates of deformation by pressure solution have been calculated. These are compared with rates of deformation by crystal plastic and high temperature diffusive flow processes, by using deformation mechanism maps. Predicted transition conditions between various deformation mechanisms are found to be consistent with those inferred from the study of textures of naturally deformed rocks.

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