Determination of activation energies in solid-state kinetics processes

1968 ◽  
Vol 72 (2) ◽  
pp. 746-747 ◽  
Author(s):  
H. N. Murty ◽  
David L. Biederman ◽  
Edward A. Heintz
Keyword(s):  
Solid State ◽  
Activation Energies ◽  
Solid State Kinetics

Novel Mg Sensors for Application in Molten Al

2008 ◽  
Vol 368-372 ◽  
pp. 265-267 ◽  
Author(s):  
Hui Zhu Zhou ◽  
Lei Dai ◽  
Yue Hua Li ◽  
Yin Lin Wu ◽  
Ling Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Solid State Reaction ◽  
Electrochemical Sensors ◽  
Activation Energies ◽  
Refining Process ◽  
Molten Aluminium ◽  
On Line ◽  
Mg Content

Mg ion conductors, MgAl2O4 and MgZr4(PO4)6, were prepared by solid state reaction. Their electrical properties were measured and their application in electrochemical sensors for on-line determination of Mg in molten Al in the refining process and alloying process was examined. The activation energies for Mg ion conduction in MgAl2O4 and MgZr4(PO4)6 are 2.08 eV and 1.7 eV, respectively. The sensors have been found to respond rapidly to the change of Mg content in molten aluminium around 1000 K.

Kinetic analysis of solid-state processes

2001 ◽  
Vol 16 (6) ◽  
pp. 1862-1871 ◽  
Author(s):  
Jiří Málek ◽  
Takefumi Mitsuhashi ◽  
José Manuel Criado
Keyword(s):  
Solid State ◽  
Kinetic Analysis ◽  
Crystallization Process ◽  
Good Description ◽  
Simple Method ◽  
Solid State Kinetics ◽  
Kinetics Of ◽  
Nonisothermal Conditions ◽  
Two Parameter

A simple method for kinetic analysis of solid-state processes has been developed. A criteria capable of classifying different processes is explored here with a view toward visualizing the complexity of solid-state kinetics. They provide a useful tool for the determination of the most suitable kinetic model. The method has been applied to the analysis of crystallization processes in amorphous ZrO2 and RuO2. It is found that the crystallization kinetics of as-prepared sample exhibits a complex behavior under nonisothermal conditions. This is probably due to an overlapping of the nucleation- and crystal-growth processes at the beginning of crystallization. As a consequence, the Johnson–Mehl–Avrami nucleation-growth model cannot be applied. A two-parameter autocatalytic model provides a good description of the crystallization process under isothermal and nonisothermal conditions.

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