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Reactions between MgAl 2 O 4  and LiF during low-temperature sintering have been examined by transmission electron microscopy. It is shown that the presence of LiF at elevated temperatures leads to the formation of a defect MgAl 2 O 4  spinel phase containing oxygen vacancies due to the incorporation of both Li and F ions into the crystal lattice. Consequently, densification is promoted via the diffusion of oxygen vacancies. Note that neither of the lithium aluminate phases, LiAlO 2  and Li 2 Al 4 O 7 , were detected.

Reactions in the sintering of MgAl 2 O 4 spinel doped with LiF