2 August 2004 Peak of a gyration tensor component of boracite crystals
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According to HAUP measurements, two ferroelectric boracites, Fe3B7O13I and Cu3B7O13Cl, manifest peaks of a gyration component g11 at each Curie point. These phenomena are entirely unintelligible from the usual concepts of the origin of ferroelectricity. Besides, the electrogyration effects of both crystals and also quite different. As has already been determined boracite crystals exhibit characteristic features of being improper ferroelectric. A phenomenological theory of improper ferroelectricity developed by Kobayashi is applied to these anomalous phenomena, and qualitative interpretations are successfully obtained.
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Toru Asahi, Toru Asahi, Tetsuya Osaka, Tetsuya Osaka, Nobuko Takahashi, Nobuko Takahashi, Kazuya Saito, Kazuya Saito, Jinzo Kobayashi, Jinzo Kobayashi, "Peak of a gyration tensor component of boracite crystals", Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.557863; https://doi.org/10.1117/12.557863

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