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Influence of Al 2 O 3 , ZnO, and K 2 O on the Opacity of Fluoride‐Opacified Glasses
Author(s) -
CALLOW R. J.
Publication year - 1952
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1952.tb13083.x
Subject(s) - opacity , fluorine , fluoride , materials science , substitution (logic) , mineralogy , composition (language) , chemistry , chemical engineering , nuclear chemistry , inorganic chemistry , metallurgy , optics , physics , computer science , programming language , engineering , linguistics , philosophy
In the glass SiO 2 71, Na 2 O 17, CaO 12% with 7.5 parts per hundred of fluorine added to the batch, substitution of up to 6% ZnO for CaO produced a great increase in the opacity; substitution of Al 2 O 3 for SiO 2 or of K 2 O for Na 2 O produced much smaller effects, which were dependent on the composition and were inappreciable in the presence of 6% ZnO. Despite the differences in opacity, no differences in fluorine content were detected. No support was found for the belief that Al 2 O 3 is essential to the successful opacification of a glass by means of fluorides.