Laboratory production of d and f alumina grains and their characteristic infrared spectra

The high-temperature phase of d-Al2O3 was produced using smoke by the gas evaporation method in a mixture gas of O2 and Ar. The f- and a-Al2O3 were produced by heating the d-Al2O3 powder. The f-phase was also produced directly by burning a mixture of Al and Cr metal powders in O2-argon gas. On the b...

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Published inMonthly notices of the Royal Astronomical Society Vol. 359; no. 2; pp. 643 - 647
Main Authors Kurumada, Mami, Koike, Chiyoe, Kaito, Chihiro
Format Journal Article
LanguageEnglish
Published 01.05.2005
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Summary:The high-temperature phase of d-Al2O3 was produced using smoke by the gas evaporation method in a mixture gas of O2 and Ar. The f- and a-Al2O3 were produced by heating the d-Al2O3 powder. The f-phase was also produced directly by burning a mixture of Al and Cr metal powders in O2-argon gas. On the basic peaks of d-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 km. The peak positions are distinct from the well-known modes of corundum (a-Al2O3), and from f-Al2O3 which has l= 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 km. The alternation of the characteristic peaks from d1f1a is clearly shown in this paper.
Bibliography:ObjectType-Article-2
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content type line 23
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2005.08937.x