Reich Stivala iterative method

An iteration method for calculation of E and n using computer data reduction techniques was also described by Reich and Stivala (127) as well as various other algorithms (128-133, 137-139) and graphical methods to determine the reaction mechanism (134-136). 

For two pairs of given values of a7/AT and T, values of E/R can be calculated from equation (5.104) for various arbitrarily selected values of n. However, assuming uniqueness, only one pair of E and n values will be pertinent. Equation (5.104) does not apply if n = l. but Reich and Stivala state that this value is rare in practice, and hence the equation is considered to be of general validity. An iteration method was also presented whereby values of E and n are computer calculated using a single DTA curve (165). 

An interesting variation on the Coats and Redfern method has been developed by Reich and Stivala (1980). The method makes use of an iterative technique to arrive at the best value of n to fit the a,T data to a rate law. It is best employed using a computer to perform aU of the computations. The integrated rate equation is written in the form... 

Reich, L., Stivala, S. S. (1980). Thermochim. Acta, 36, 103. The computer method of applying the Coats and Redfem method iteratively. 

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