Abstract
The domain structure in crystals of natural and synthetic haematite has been examined using the colloid method. A special acetone based colloid was developed which allowed the domain structure to be observed down to -30 °C. In the case of the synthetic crystals, the domain structure disappeared below -14 °C (the transformation temperature to the antiferromagnetic state), whereas no change was observed for haematite crystals from Elba. A detailed account is given of the stages leading to the disappearance of the domain structure for one of the synthetic crystals.

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