TEM observation of disproportionation of mullite and sillimanite under shock compression

Journal Article · Wed Dec 12 00:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2832994· OSTI ID:21039539

Atou, T; Kawai, N; Nakamura, K G; Kondo, K ^[1]; Ito, S; Yubuta, K ^[2]; Kikuch, M ^[3]

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1. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama 226-8503 (Japan)
2. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)
3. Kansei-Fukushi Laboratory, Tohoku Fukushi University, Kunimigaoka 6-149-1, Aoba-ku, Sendai 989-3201 (Japan)

Shock recovery experiment on sillimanite was conducted using a two-stage light-gas gun to clarify origin of the peculiar nano-frgmentation observed in mullite. Recovered sillimanite was examined by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Shock recovered sillimanite showed amorphization by XRD measurements as seen in mullite. However, microtexture observed by TEM showed characteristic planar deformation structures and following amorphization, which are considerably different from those observed in mullite. Importance of oxygen vacancies in crystal structure of mullite for the nano-fragmentation was inferred from comparison to the present result on sillimanite.

• OSTI ID: 21039539
• Journal Information: AIP Conference Proceedings, Vol. 955, Issue 1; Conference: Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, Waikoloa, HI (United States), 24-29 Jun 2007; Other Information: DOI: 10.1063/1.2832994; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
COMPARATIVE EVALUATIONS
COMPRESSION
DEFORMATION
MULLITE
OXIDATION
OXYGEN
PHASE TRANSFORMATIONS
SHOCK WAVES
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES
X-RAY DIFFRACTION