Peak of a gyration tensor component of boracite crystals

T. Asahi*, T. Osaka, N. Takahashi, K. Saito, J. Kobayashi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


According to HAUP measurements, two ferroelectric boracites, Fe 3B7O13I and Cu3B7O 13Cl, 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 are 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.

Original languageEnglish
Article number39
Pages (from-to)277-284
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2004
EventComplex Mediums V: Light and Complexity - Denver, CO, United States
Duration: 2004 Aug 42004 Aug 5


  • Electrogyration
  • HAUP
  • Improper ferroelectrics
  • Optical activity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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