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Title

Trigonal Boracites - A New Type of Ferroelectric and Ferromagnetoelectric that Allows no 180° Electric Polarization Reversal
Author
Schmid, Hans
Published in Physica Status Solidi. B. 1970, vol. 37, no. 1, p. 209-223
Abstract The space group of the trigonal phase of the Fe-Cl, Fe-Br, Fe-I, Co-Cl, and Zn-Cl boracites is established as C63v. Ferroelectricity is evidenced by domain switching. High coercive fields at room temp. (up to 8000 kV/cm) are found. Polarization-microscopic studies show that the polarization vector is not reversible by 180°, but can jump only from, e.g., [111] to [111], [111], or [111], etc., in accord with crystal-structure and group-theoretical symmetry considerations. Two twinning "laws" are observed: (a) head-head (tail-tail), domains with {110}cub as compn. plane and (b) head-tail domains with {100}cub as compn. plane. The domain structure and the relevant twinning operations are discussed. The onset of ferromagnetism at low temp. in Fe-Cl, Fe-Br, Fe-I, and Co-Cl boracites leads to ferromagnetoelectricity. In the case of Co-Cl boracite, the ferromagnetoelec. point group is m.
Keywords Ferroelectric substances (boracites) — Magnetoelectric effect (in boracites) — Ferroelectric domains — Coercive force (of boracites) — Trigonal boracites ferroelecs — Boracites trigonal ferroelecs — Ferroelecs trigonal boracites — Ferromagnetoelecs boracites
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Article (Published version) (2.4 MB) - public document Free access
Other version: http://doi.wiley.com/10.1002/pssb.19700370125
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(ISO format) 		SCHMID, Hans. Trigonal Boracites - A New Type of Ferroelectric and Ferromagnetoelectric that Allows no 180° Electric Polarization Reversal. In: Physica Status Solidi. B, 1970, vol. 37, n° 1, p. 209-223. https://archive-ouverte.unige.ch/unige:32931

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