Effects of excess carbon and vibrational properties in ultrafine SiC powders S. Charpentier, A. Kassiba, A. Bulou, M. Monthioux and M. Cauchetier Eur. Phys. J. AP, 8 2 (1999) 111-121 Published online: 15 September 1999 DOI: 10.1051/epjap:1999236