Free access article

A&A 422, 975-979 (2004)
DOI: 10.1051/0004-6361:20034353

Direct observation of the metamorphism of silicon oxide grains

K. Kamitsuji, S. Ueno, H. Suzuki, Y. Kimura, T. Sato, T. Tanigaki, O. Kido, M. Kurumada and C. Kaito

Department of Nanophysics in Frontier Projects, Ritsumeikan University, Kusatsu-shi, Shiga 525-8577, Japan
    e-mail: rp007988@se.ritsumei.ac.jp

(Received 19 September 2003 / Accepted 23 March 2004 )

Abstract
Experimental studies on the metamorphism of SiO _x grains under heating at 10 ^-6 Pa have been conducted using a high-resolution transmission electron microscope. Si crystallites were predominantly grown at 500 to 700  C in SiO _x grains. The Si crystallites disappeared at 800  C and evaporated as the SiO phase.

Key words: astrochemistry -- acceleration of particles -- method: laboratory -- Stars: AGB and post-AGB -- stars: circumstellar matter -- ISM: dust, extinction

© ESO 2004

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