Diffusion of Co in Zr 46.75Ti 8.25Cu 7.5Ni 10Be 27.5 bulk metallic glass under high pressure is investigated in supercooled liquid region by ion implantation combined with secondary ion mass spectroscopy.Before implantation of Co atoms,the amorphous samples were annealed and relaxed in supercooled liquid region.Diffusion coefficients of Co at 603K in the relaxed samples are found to increase with increasing pressure.And the activation volume for diffusion is obtained to be -1.236Ω,where Ω is ...