Scientific Article
previous document  unige:32931  next document
add to browser collection
Title

Trigonal Boracites - A New Type of Ferroelectric and Ferromagnetoelectric that Allows no 180° Electric Polarization Reversal

Author
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 domainsCoercive force (of boracites)Trigonal boracites ferroelecsBoracites trigonal ferroelecsFerroelecs trigonal boracitesFerromagnetoelecs boracites
Identifiers
Full text
Citation
(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

203 hits

137 downloads

Update

Deposited on : 2014-01-08

Export document
Format :
Citation style :