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- W2149167788 abstract "The space group of the trigonal phase of the FeCl, FeBr, FeI, CoCl, and ZnCl boracites is established as C. Ferroelectricity is evidenced by domain switching. High coercive fields at room temperature (up to 800 kV/cm) are found. Polarization-microscopical 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 composition plane and b) head—tail domains with {100}cub as composition plane. The domain structure and the relevant twinning operations are discussed. The onset of ferromagnetism at low temperature in FeCl, FeBr, FeI, and CoCl boracites leads to ferromagnetoelectricity. In the case of CoCl boracite the ferromagentoelectric point group is m. Die Raumgruppe der trigonalen Phase der FeCl-, FeBr-, FeI-, CoCl- und ZnCl-Borazite wurde zu C bestimmt. Ferroelektrizität wird durch Bereichumklappung nachgewiesen. Die Koerzitivfelder bei Zimmertemperatur sind sehr hoch (bis zu 800 kV/cm). Polarisationsmikroskopische Studien zeigen, daß der Polarisationsvektor nicht um 180° umklappbar ist, sondern nur von z. B. [111] nach [111], [111], oder [111] usw. springen kann. Dies steht in Übereinstimmung mit der Kristallstruktur und Symmetriebetrachtungen. Zwei Zwillings„gesetze”︁ treten auf: a) Kopf—Kopf (Schwanz—Schwanz) -Bereiche mit {110}cub und b) Kopf—Schwanz-Bereiche mit {100}cub als Verwachsungsebene. Die Bereichstruktur und die entsprechenden Zwillingsoperationen werden besprochen. Das Auftreten von Ferromagnetismus bei tiefen Temperaturen führt bei FeCl-, FeBr-, FeI- und CoCl-Boraziten zu Ferromagnetoelektrizität. CoCl-Borazit hat die ferromagnetoelektrische Punktgruppe m." @default.
- W2149167788 created "2016-06-24" @default.
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- W2149167788 date "1970-01-01" @default.
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- W2149167788 title "Trigonal Boracites — A New Type of Ferroelectric and Ferromagnetoelectric that Allows no 180° Electric Polarization Reversal" @default.
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- W2149167788 doi "https://doi.org/10.1002/pssb.19700370125" @default.
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