The growth mechanism of Si-faceted dendrite was studied using an in situ observational technique. We directly observed the growth processes of Si-faceted dendrites from Si melts. It is found that triangular corners with an angle of 60 degrees are formed at the dendrite tip. We present an original growth model for faceted dendrites based on the experimental evidence. The model fully explains the growth process of faceted dendrites.

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Nanosized cylindrical structures consisting of a SiC core and a crosslinked polysilane coating (see Figure and also inside front cover) are produced here by ion beam irradiation of a polysilane film. It is shown that both the radius and length of the nanowires can be controlled by altering the incident ion beam, molecular weight of the polymer, and thickness of the target film.

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