Hollow, regularly shaped hexagonal Si 3 N 4 microtubes (see Figure) have been synthesized by reaction of cobalt metal with silicon diimide. Some are partially and some completely filled with metallic inclusions, which were identified as Co 2 Si. The formation of crystalline transparent filaments with non‐transparent spherical or polyhedral particles at the tip is also reported. magnified image
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Huppertz et al. (1996) studied this question.
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