An explanation is given for the narrow peak in the temperature dependence of the component α 32 of the magnetoelectric effect tensor near the transition at T = T c to the m ′ m 2′ phase observed in the boracites. A phenomenological approach is used which is based on the symmetry of the cubic phase of the crystals. The change in the sign of α 23 and α 32 observed in some of the boracites as the temperature is lowered is attributed to the low value of T c .
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D. G. Sannikov (1997) studied this question.
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