Photometric Study of the Oxygen Diffusivity in an Aluminosilicate Glass

The diffusivity of oxygen in an aluminosilicate glass from 630° to 830°C is derived from optical transmission measurements, wherein the rate of bleaching of Ti3+ color centers by the diffusing oxygen at temperature was measured. The finite-thickness solution to the heat equation is used to interpret...

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Bibliographic Details
Published in:Journal of applied physics 1970-04, Vol.41 (5), p.1926-1929
Main Authors: Lawless, W. N., Wedding, Brent
Format: Article
Language:English
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Summary:The diffusivity of oxygen in an aluminosilicate glass from 630° to 830°C is derived from optical transmission measurements, wherein the rate of bleaching of Ti3+ color centers by the diffusing oxygen at temperature was measured. The finite-thickness solution to the heat equation is used to interpret the data; the oxygen diffusivity on this temperature range can be represented by D=28.4 exp (−39.6±3.4 kcal/RT)cm1/sec. It is concluded that the oxygen diffuses interstitially as molecular oxygen, because the activation energy is smaller than the energy to split an Si–O bond: 50 kcal/mole. As a check on the technique and results, penetration measurements were made on a moving color boundary, with identical results.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1659143