The effect of added titanium and aluminium on the magnetic behaviour of α ferric oxide

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Abstract
An examination is made of the magnetic behaviour of hematite, a Fe2O3, in the region of the antiferromagnetic transition temperature (−15°c) when titanium and alumininm are added in small amounts as an impurity. contrary to an earlier observation by Morin, the transition is still observed in the synthesized material for relatively large impurity contents (∼10%). The magnetic properties and behaviour of some naturally occurring hematites are compared with the synthesized materials, and are shown to be very etructure sensitive. Thus the fact that this antiferromagnetic transition is not observed in natural hematite-bearing sandstones is thus probably not due to the presence of impurities but to some effect of crystal structure.

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