Abstract
The effect of trivalent ions, such as Al 3+, Ga 3+, Cr 3+ and In 3+, on the Morin phase transition in hematite was studied by the neutron diffraction method. It was found that the angle by which the magnetic moments turn out of the basal plane in the Morin transition decreases with increasing concentration. When a critical concentration is reached: 9, 5, 2.5 and 1.5 at% for Al, Ga, Cr and In, respectively, the angle becomes zero, i.e., the Morin transition no longer occurs.
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