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

doi:10.1180/mgm.2019.27

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

Material Science of Solar Planets

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 language	English
Pages (from-to)	561-567
Number of pages	7
Journal	Mineralogical Magazine
Volume	83
Issue number	4
DOIs	https://doi.org/10.1180/mgm.2019.27
Publication status	Published - Aug 1 2019

All Science Journal Classification (ASJC) codes

Geochemistry and Petrology

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10.1180/mgm.2019.27

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title = "The importance of cation-cation repulsion in the zircon-reidite phase transition and radiation-damaged zircon",

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.",

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AU - Tokuda, Makoto

AU - Yoshiasa, Akira

AU - Kojitani, Hiroshi

AU - Hashimoto, Saki

AU - Uehara, Seiichiro

AU - Mashimo, Tsutomu

AU - Tobase, Tsubasa

AU - Akaogi, Masaki

PY - 2019/8/1

Y1 - 2019/8/1

N2 - 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.

AB - 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.

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

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