Correlations between Crystallite Size, Shape, Surface, and Infrared Spectra Using the Ti-C System

Details Correlations between Crystallite Size, Shape, Surface, and Infrared Spectra Using the Ti-C System Correlations between Crystallite Size, Shape, Surface, and Infrared Spectra Using the Ti-C System

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..152..297k&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 152, Issue 2, pp. 297-301.

Astronomy and Astrophysics

Astronomy

3

Astrochemistry, Ism: Dust, Extinction, Ism: Molecules, Methods: Laboratory, Molecular Data

Scientific paper

TiC crystallites less than 10 nm in size showed an absorption feature at 14.3 μm. This 14.3 μm absorption was rarely seen in specimens ranging from bulk material to grains of 50 nm in size. The 14.3 μm feature was weakened as a result of the growth of TiC crystallites by heat treatment. When the carbide grains were covered with a carbon layer, the absorption peaks were considerably weakened, i.e., the absorption intensity depended on the grain surface state. A possible explanation is that the effects of size and shape on the spectra depend on the surface anisotropy.

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