Evolution of the structure of Si/C/N nano-composite powders formed by laser-aerosol interaction
Conference
·
OSTI ID:99127
- CEN Saclay, Gif-Yvette (France); and others
Ultrafine, amorphous Si/C/N powders with a controlled chemical composition were produced by Laser-Aerosol interaction from a mixture of hexamethyldisilazane and ammonia. The conversion process of amorphous Si/C/N particles to crystalline SiC-Si{sub 3}N{sub 4} nanocomposite powders was studied by XRD and 29-Si MAS NMR after several thermal treatments in nitrogen. All the powders stay amorphous below 1500{degrees}C, but the local environment around Si atoms changes, showing a gradual conversion of SiN{sub 4} tetrahedrons to SiCN{sub 3} and SiC{sub 2}N{sub 2} to end at SiC{sub 4} configuration, wich suggests a reaction between the Si/C/N network and a free carbone phase.
- OSTI ID:
- 99127
- Report Number(s):
- CONF-940911--
- Country of Publication:
- United States
- Language:
- English
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