|
|||||
|
|
The polycarbosilane-to-SixC1−x conversion studied by inelastic neutron scattering and infrared absorption |
|
| Authors: | Kentaro Suzuya Kaoru Shibata Kiyohito Okamura Kenji Suzuki |
| Institution: | a Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980, Japan b College of Metallurgical Engineering, University of Osaka Prefecture, Mozu-umemachi, Sakai, Osaka 591, Japan |
| Abstract: | Polycarbosilane (PC) is a precursor which is converted to SixC1?x fibers by pyrolysis in an inert gas atmosphere. The changes in the atomic vibrational spectrum during the conversion process from PC to SixC1?x have been examined by means of inelastic neutron scattering (INS) and infrared absorption (IR). The existence of transverse-optical(TO)- and longitudinal-optical(LO)-like phonon modes due to amorphous SiC clusters was established in the original and pyrolyzed PC by INS measurements. After pyrolyzing at 700–800°C, these modes appear distinctly around 730 and 930 cm?1, respectively, in the INS spectra. Pyrolysis at 1000°C makes these TO- and LO-like phonon modes sharper. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |