The importance of cation-cation repulsion in the zircon-reidite phase transition and radiation-damaged zircon

Makoto Tokuda, Akira Yoshiasa, Hiroshi Kojitani, Saki Hashimoto, Seiichiro Uehara, Tsutomu Mashimo, Tsubasa Tobase, Masaki Akaogi

Research output: Contribution to journalArticle

Abstract

Single crystals of synthetic reidite and natural radiation-damaged zircon from Okueyama, Japan were investigated using X-ray diffraction. The pressure-induced zircon-reidite transition is described by the twisting and translations of SiO4 tetrahedra with disappearance of the SiO4-ZrO8 shared edges. The lattice of radiation-damaged zircons expands mainly from α-decays of radioactive elements such as U and Th. Although old radiation-damaged zircons show anomolous lattice distortion, young radiation-damaged zircons do not show such distortions. These distortions are caused by thermal recovery that suppresses the Si4+-Zr4+ repulsion between the SiO4 tetrahedron and ZrO8 dodecahedron. These changes in structure can be understood by considering the cation-cation repulsion between the SiO4-ZrO8 shared edges.

Original languageEnglish
Pages (from-to)561-567
Number of pages7
JournalMineralogical Magazine
Volume83
Issue number4
DOIs
Publication statusPublished - 2019 Aug 1
Externally publishedYes

Keywords

  • cation-cation repulsion
  • phase transition
  • radiation damage
  • reidite
  • zircon

ASJC Scopus subject areas

  • Geochemistry and Petrology

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    Tokuda, M., Yoshiasa, A., Kojitani, H., Hashimoto, S., Uehara, S., Mashimo, T., Tobase, T., & Akaogi, M. (2019). The importance of cation-cation repulsion in the zircon-reidite phase transition and radiation-damaged zircon. Mineralogical Magazine, 83(4), 561-567. https://doi.org/10.1180/mgm.2019.27