The migration of GeO2 in vitreous silica was studied as a function of time, temperature and O content of the surrounding atmosphere. The diffusion coefficient of O2 molecules was described by:

log[D(cm2/s)] = -7999/T(K) – 1.865

The GeO2 diffusion constant decreased, for a given temperature, with increasing O content of the sample, and increased with increasing GeO2 content. The average value was given by:

log[D(cm2/s)] = -23221/T(K) + 0.095

H.Rau, W.Hermann: Berichte der Bunsengesellschaft für Physikalische Chemie, 1987, 91[8], 833-40