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US 5,204,077 AGranted
Pollucite crystalline powders with low thermal expansion coefficients and methods for their preparation
AssigneeTosoh Corporation
InventorsToshiyuki Mori, Hiroshi Yamamura, Takashi Mitamura, Hidehiko Kobayashi
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Abstract
A pollucite powder consisting essentially of a pollucite phase and having an Al.sub.2 O.sub.3 /SiO.sub.2 molar ratio of from 0.21 to 0.25 and a Cs.sub.2 O/SiO.sub.2 molar ratio of from 0.19 to 0.22.
Claims1
A pollucite powder consisting essentially of a pollucite crystal structure and having an Al.sub.2 O.sub.3 /SiO.sub.2 molar ratio of from 0.21 to 0.25, a (Cs.sub.2 O+Li.sub.2 O)/SiO.sub.2 molar ratio of from 0.19 to 0.22 and a Li.sub.2 O/Cs.sub.2 O molar ratio of from 2/98 to 10/90.
Dependencies are inferred from the claim text.