The effects of sintering temperature and cooling rate on the magnetic and crystallographic properties of lithium ferrite were studied. The magnetic moments and lattice parameters increased with increasing sintering temperature; these increases result from correlated oxygen and lithium oxide losses. Either annealing at lower temperatures or slow cooling under O 2 causes reoxidation of the Fe 2+ formed at higher temperatures with attendant decreases in moment and lattice parameter and gradual precipitation of α‐Fe 2 O 3 as a second phase. The products formed on rapid cooling are equivalent to solid solutions of spinel lithium ferrite with Fe 3 O 4 , and those formed on slow cooling, to solid solutions of lithium ferrite and γ‐Fe 2 O 3 with precipitation of α‐Fe 2 O 3 . Lithium losses and α‐Fe 2 O 3 precipitate amounts are calculated. The magnetic moment of stoichiometric lithium ferrite at 25°C is 3736±20 G; the lattice parameter at 28°C is 8.3296±0.0005 Å.
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Ridgley et al. (1970) studied this question.
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