Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.359..643k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 359, Issue 2, pp. 643-647.
Astronomy and Astrophysics
Astronomy
1
Line: Identification, Instrumentation: Miscellaneous, Methods: Laboratory, Techniques: Spectroscopic, Dust, Extinction, Infrared: General
Scientific paper
The high-temperature phase of δ-Al2O3 was produced using smoke by the gas evaporation method in a mixture gas of O2 and Ar. The θ- and α-Al2O3 were produced by heating the δ-Al2O3 powder. The θ-phase was also produced directly by burning a mixture of Al and Cr metal powders in O2-argon gas. On the basic peaks of δ-Al2O3, the characteristic infrared peaks were observed at 10.4, 10.8, 11.4, 11.9, 12.4, 12.7, 13.0, 13.6, 14.2, 15.2, 15.8, 16.2, 17.0, 17.9 and 19.0 μm. The peak positions are distinct from the well-known modes of corundum (α-Al2O3), and from θ-Al2O3 which has λ= 11.7, 12.0, 12.1-12.6, 13.6, 13.9-14.0, 15.8-16.0, 16.3, 17.1 and 18.5-19.2 μm. The alternation of the characteristic peaks from δ->θ->α is clearly shown in this paper.
Kaito Chihiro
Koike Chiyoe
Kurumada Mami
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