Water-free fused silica for laser windows made by the reactive atmosphere process

We have produced by the reactive atmosphere process (RAP) a new form of fused silica that is nearly free (of the order of 1 ppm) of water-derived impurities (OH −, H +). This RAP-fused silica is a vitreous form of the cristobalite crystal phase of SiO 2 and not the quartz phase. Therefore, it is cal...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1987, Vol.89 (1), p.181-190
Main Authors: Deshazer, L.G., Gorre, L.E., Pastor, R.C.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Glasses
Special glasses
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Summary:We have produced by the reactive atmosphere process (RAP) a new form of fused silica that is nearly free (of the order of 1 ppm) of water-derived impurities (OH −, H +). This RAP-fused silica is a vitreous form of the cristobalite crystal phase of SiO 2 and not the quartz phase. Therefore, it is called “fused cristobalite”. This fused cristobalite exhibits simultaneously increased resistance to nuclear radiation, with no damage up to 10 Mrad (of 60Co gamma irradiation), and greatly increased IR transparency due to the lack of water absorption at the 2.73 μm OH stretch vibrational band. We present absorption measurements in the near-IR comparing our RAP-fused cristobalite with seven types of commercial fused sillica.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(87)80331-9