Ultraviolet transmitting glasses for EPROM windows

Details Ultraviolet transmitting glasses for EPROM windows Ultraviolet transmitting glasses for EPROM windows

1989-02-27

1990-05-15

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 56, 501905, C03C 3091

Patent

active

049258141

ABSTRACT:
Ultraviolet transmitting glasses exhibiting coefficients of thermal expansion between 46-52.times.10.sup.-7 /.degree. C. and transmittances at a thickness of 1 mm of at least 80% at a wavelength of 254 nm which are essentially free of fluoride and consist essentially, in mole percent, of 60-70% SiO.sub.2, 16-20% B.sub.2 O.sub.3, 1-8% Al.sub.2 O.sub.3, 1-6% Li.sub.2 O, 2.5-5% N.sub.2 O, 0-3% K.sub.2 O, and 0-25% Cl, wherein the mole ratio R.sub.2 O:R.sub.2 O.sub.3 is greater than 0.3, but less than 0.5.

REFERENCES:
patent: 4792535 (1988-12-01), Fine

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