Present TiC crystallites with the size of less than 3 nm were shown at 14 μm absorption feature. This 14 μm absorption was hardly seen from the bulk to 50 nm size. The absorption feature at 14 μm was weakening due to the growth of TiC crystallites by the heat treatment. Moreover the absorption intensity was depended on the grain surface, i.e., if the carbide grains were covered with carbon layer as is observed in the meteorite, the absorption peaks were remarkably weakening.
