scholarly journals Kinetics of Solid State Reactions in 2FeO–SiO2 and 2NiO–SiO2 Systems

1985 ◽  
Vol 26 (8) ◽  
pp. 542-548
Author(s):  
Masayasu Kawahara ◽  
Toshiharu Mitsuo ◽  
Yoshinori Shirane
Keyword(s):  
Solid State ◽  
Solid State Reactions ◽  
Kinetics Of

Theory of nucleation in solid state reactions

1968 ◽  
Vol 46 (2) ◽  
pp. 111-116 ◽  
Author(s):  
A. R. Allnatt ◽  
P. W. M. Jacobs
Keyword(s):  
Solid State ◽  
Approximate Model ◽  
Single Step ◽  
Solid State Reactions ◽  
Avrami Equation ◽  
Nucleation Process ◽  
Special Cases ◽  
New Equation ◽  
Kinetics Of ◽  
Short Times

The theory of nucleation in solid state reactions is formulated in a general way and a solution to the problem of multi-step nucleation obtained. Two special cases of the general formulation are considered: the second of these corresponds to Bagdassarian's approximate model and some corrections to his treatment are pointed out. A new equation describing the kinetics of a solid state reaction, which involves multi-step nucleation followed by a constant and isotropic rate of growth, is derived. This equation is termed the generalized Avrami equation since it removes the restriction, in Avrami's treatment, of a single-step nucleation process. Erofeev's analysis of the problem is shown to be valid only in the limit of short times: the generalized Avrami equation reduces to Erofeev's equation in this limit.

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