Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299...78m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 1, pp. 78-82.
Astronomy and Astrophysics
Astronomy
11
Line: Identification, Instrumentation: Miscellaneous, Techniques: Miscellaneous, Circumstellar Matter, Dust, Extinction, Infrared: General
Scientific paper
Amorphous silicon oxide films have been studied on the basis of electron diffraction (ED) analyses and infrared (IR) spectroscopy in order to elucidate the relationship between the structures. After the heat treatment of the film in air at 300 and 500 degC, the ED pattern showed halo rings, and the IR spectra clearly changed. Intensity analysis of the ED pattern provided evidence for the structural change of the amorphous film. It was concluded that the spectral changes in the ranges of 9.2-10.2, 12.5-13.5 and 19.5-22.5mum were the result of phase transitions of the microcrystallites of alpha-cristobalite to beta-cristobalite, and alpha- or beta-quartz. Astrophysical implications have been discussed.
Kaito Chihiro
Kimura Seiji
Koike Chiyoe
Morioka Tomonari
Saito Yoshio
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