A kinetic study of the system γ-AlOOHAl2O3

A time-temperature study has been made of the system: $\text{γ-}\text{AlOOH (boehmite)}\text{Al}{}_2\text{O}{}_3$. The isothermal TTT diagram produced demonstrates the course of the transformation sequence, which involves a number of metastable transition alumina intermediate phases. This type of treatment allows calculation of kinetic parameters for the various transformation processes, and these may be correlated with the mechanisms operating. Kinetic aspects of variations in microstructure and crystal structure have also been studied. In particular, the progress of cation migration processes involved in the transformation γ → δ-Al₂O₃ has been followed in terms of the continuous variation of the spinel subcell parameters.