INTERNAL FRICTION STUDY OF THE HIGH TEMPERATURE DISLOCATION MOBILITY IN Si SINGLE CRYSTALS P. GADAUD, J. WOIRGARD, P. MAZOT, J.L. DEMENET and J. de FOUQUET J. Phys. Colloques, 48 C8 (1987) C8-101-C8-106 DOI: 10.1051/jphyscol:1987811