Glass with noticeably improved stability to radiation damaging, a process for its production as well as its use
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United States of America Patent
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Apr 24, 2007
Grant Date -
Aug 11, 2005
app pub date -
Jan 7, 2005
filing date -
Jan 8, 2004
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Abstract
A glass with high internal transmission as well as low tendency to radiation-caused physical compaction and low tendency to solarization, comprising 18 to 31% by weight of SiO.sub.2, 0 to 7% by weight of Na.sub.2O.sub.3, 0 to 7% by weight of K.sub.2O, 65 to 84% by weight of PbO, 0.001 to 1% by weight of As.sub.2O.sub.3+As.sub.2O.sub.5, which is characterized by a content of 0 to 5000 ppm of Sb.sub.2O.sub.3 0 to 500 ppm of TiO.sub.2 0 to 100 ppm of CuO 0 to 1000 ppm of F. The .SIGMA.(As.sub.2O.sub.3, As.sub.2O.sub.5, Sb.sub.2O.sub.3, F).gtoreq.20 ppm and the ratio of As(III)/As(V) is at least 0.5. Such a glass is suitable for the use as optical element.
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