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Determination of appropriate reaction model(s) in solid state reactions has been confronting with serious discrepancies over the decades. The dilemma in the choice of reaction models originates from the use of oversimplified methods to handle the complicated multi-step kinetics. In order to minimize these discrepancies, an advanced reaction model determination methodology is put forward which deals with variable energy of activation concept. This methodology is expected to fairly simulate single step as well as multi-step reaction kinetics. The fresh expressions for the well known reaction models under this methodology are derived and their validity conditions are discussed. The methods for determining pre-exponential factor(s) in single step and mutli-step processes are also reviewed. The precautions while using the said methodology and its prospective applications are also discussed.