The amorphization and disproportionation of mullite (3Al2O 32SiO2) under shock compression

Nobuaki Kawai, Toshiyuki Atou, Shun Ito, Kunio Yubuta, Masae Kikuchi, Kazutaka G. Nakamura, Ken Ichi Kondo

研究成果: Conference contribution

抄録

Shock-recovery experiments have been performed on mullite polycrystals in the pressure range up to 65 GPa by using a two-stage light-gas gun. The recovered samples have been examined by using X-ray diffraction method and transmission electron microscope observation. In the samples shocked at 40 and 49 GPa, an amorphization of mullite occurs. Mullite nanocrystals with grain sizes less than 10nm are dispersed in the amorphous phase, indicating that the relatively large starting mullite crystals become nanocrystals accompanied with the amorphization. In contrast, at 65 GPa, the mullite decomposes into amorphous SiO2 and γ-Al2O3. Very fine γ-Al2O3 particles less than 10 nm are observed in the matrix of the amorphous SiO2, suggesting that a rapid disproportionation reaction of mullite have been induced during short shock event. The crystallization of γ-Al2O3 may occur during a pressure-release process.

本文言語English
ホスト出版物のタイトルSHOCK COMPRESSION OF CONDENSED MATTER - 2005
ホスト出版物のサブタイトルProceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
ページ248-251
ページ数4
DOI
出版ステータスPublished - 2006 12 1
イベントSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter - Baltimore, MD, United States
継続期間: 2005 7 312005 8 5

出版物シリーズ

名前AIP Conference Proceedings
845 I
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

OtherSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
国/地域United States
CityBaltimore, MD
Period05/7/3105/8/5

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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