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

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)561-567
ページ数7
ジャーナルMineralogical Magazine
83
4
DOI
出版ステータスPublished - 2019 8 1
外部発表はい

ASJC Scopus subject areas

  • Geochemistry and Petrology

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