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Proceedings Paper

Peak of a gyration tensor component of boracite crystals
Author(s): Toru Asahi; Tetsuya Osaka; Nobuko Takahashi; Kazuya Saito; Jinzo Kobayashi
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Paper Abstract

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.

Paper Details

Date Published: 2 August 2004
PDF: 8 pages
Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.557863
Show Author Affiliations
Toru Asahi, Waseda Univ. (Japan)
Tetsuya Osaka, Waseda Univ. (Japan)
Nobuko Takahashi, Waseda Univ. (Japan)
Kazuya Saito, Toyota Technological Institute (Japan)
Jinzo Kobayashi, Waseda Univ. (retired) (Japan)


Published in SPIE Proceedings Vol. 5508:
Complex Mediums V: Light and Complexity
Martin W. McCall; Graeme Dewar, Editor(s)

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