Nucleation and grain growth model for reduction of hematite to magnetite.

Abstract

In the present investigation hematite samples were reduced to magnetite by a mixture of H 2 and H 2 O at 650, 700, and 750 °C. These data have been analyzed with the Johnson-Mehl equation and found to fit well in the nucleation and grain growth model.Activation energy values ​​of the reaction were calculated by different methods and have been found to match closely.