Low alpha-ray level glass and method for manufacturing the same

Details Low alpha-ray level glass and method for manufacturing the same Low alpha-ray level glass and method for manufacturing the same

1997-04-25

1999-08-24

Williams, Alexander Oscar

Active solid-state devices (e.g., transistors, solid-state diode

With means to control surface effects

Insulating coating

257794, 257704, C03C 3095, C03C 3108, C03C 3115, C03G 3118

Patent

active

059427930

ABSTRACT:
A low alpha-ray level glass which emits only an extremely small amount of alpha-ray while maintaining excellent chemical durability, coefficient of thermal expansion and hardness is obtained by introducing fluorine into a SiO.sub.2 --B.sub.2 O.sub.3 --Al.sub.2 O.sub.3 --R.sub.2 O (R being an alkali metal) system glass of a specific content range. The amount of alpha-ray emitted from this glass is below 0.02 count/cm.sup.2.hr.

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