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ALUMINA‐SILICA RELATIONSHIP IN GLASS *
Author(s) -
Safford Hurd W.,
Silverman Alexander
Publication year - 1947
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.1151-2916.1947.tb19556.x
Subject(s) - silicon , aluminium , coordination number , silicate , atom (system on chip) , silicate glass , materials science , mineralogy , inorganic chemistry , chemistry , metallurgy , ion , organic chemistry , computer science , embedded system
A bstract Assuming from a consideration of silicate minerals that aluminum should replace silicon in silicates, the authors investigated the system Na 2 O‐CaO‐SiO 2 ‐Al 2 O 3 . Densities and refractive indices have been determined and molecular refractions have been calculated. Partial molecular refractivities of Al 2 O 3 indicate a coordination number of 4 for aluminum and deviate appreciably from values for compounds in which aluminum has a coordination number of 6. Interionic distances have been calculated for Si—O and Al—O. As a result of these studies, it is concluded that the aluminum atom isomorphously replaces the silicon atom in the random fetrahedral network. With this replacement, Ca ++ can increasingly replace Na + in the interstices of the open structure.