GRAIN GROWTH KINETICS IN Li-MgO·1.21Al₂O₃ SPINEL

Grain growth in MgO·nAl₂O₃ spinel is strongly affected by its stoichiometric ratio, where for n≥1 spinel it is fairly limited comparing to samples with n 2O₄ has been extensively studied, the effect of lithium on grain growth, remain unclear. In the current study the effect of lithium on the grain growth kinetics of non-stoichiometric, MgO·1.21Al₂O₃ spinel was investigated. Preliminary results show that the grain growth kinetics in Li doped MgO·1.21Al₂O₃ is strongly dependent not only on the Li amount but also on the grain size. The relations between the grain size, lithium amount and grain growth kinetics in non-stoichiometric magnesium aluminate spinel will be discussed.