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The structure of some sodium and calcium aluminosilicates

Pauling, Linus (1930) The structure of some sodium and calcium aluminosilicates. Proceedings of the National Academy of Sciences of the United States of America, 16 (7). pp. 453-459. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas30b

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Abstract

Two years ago it was pointed out(1) that the electrostatic valence rule requires that the aluminum ions in alkali aluminum silicates have the coordination number 4 rather than 6, oxygen ions in the crystal then being common to a silicon tetrahedron, an aluminum tetrahedron, and one or more alkali-ion polyhedra. Since that time examples of such structures have been found. Thus the cubic crystal sodalite,(2) Na4Al3Si3O12Cl, has a framework composed of tetrahedra, each of which shares its corners with four others, silicon and aluminum tetrahedra alternating. The three parameters determining the position of the oxygen atoms were evaluated from the x-ray data, and it was found that both the silicon and the aluminum tetrahedra are approximately regular, with the distances Si-O = 1.60 Å and Al-O = 1.74 Å. The sodium and chlorine ions are arranged in cavities in the tetrahedral framework.


Item Type:Article
Additional Information:Copyright © 1930 by the National Academy of Sciences. Read before the Academy April 29, 1930.
Record Number:CaltechAUTHORS:PAUpnas30b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas30b
Alternative URL:http://www.pnas.org/content/vol16/issue7/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1419
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Jan 2006
Last Modified:14 Nov 2014 19:18

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