Diffusion of Oxygen in Fused Silica

Oxygen diffusion in fused silica was measured over the range 850° to 1250°C by means of heterogeneous isotope exchange. In this temperature range and at 1 atm oxygen pressure the diffusion coefficients can be represented by the relation: D = 2 × 10 −9 exp (‐29 kcal/ RT). The oxygen diffusion coefficients are almost directly proportional to the oxygen pressure which suggests that the oxygen is diffusing in a molecular form.