Young's modulus and internal friction of natural crystals of α-Fe2O3 (Congonhas, Brazil) were measured as functions of temperature in the region of the Morin transition with and without a 1570-oe magnetic field. Nonelastic components of strain occur and these, we suggest, are due to stress-induced changes in the directions of the magnetization vectors.
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Makkay et al. (1962) studied this question.
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