Silicate melts are complicated in structure and composition. Hence, diffusion in a melt (in this chapter, a melt includes both liquid and glass) can be very complicated due to the presence of many components, each of which can be present in different species, as well as various kinds of diffusion, such as self-diffusion, tracer diffusion, interdiffusion, effective binary diffusion and multi-component diffusion. In this chapter, the diffusion of H, C and O components is reviewed. H may be in the form of H2O molecules (hereafter referred to as H2Om), OH groups (hereafter referred to...

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