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Science 24 December 1965:
Vol. 150. no. 3704, pp. 1713 - 1714
DOI: 10.1126/science.150.3704.1713
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Articles

Clathrate Structure of Silicon Na8Si46 and NaxSi136 (x < 11)

John S. Kasper 1, Paul Hagenmuller 2, Michel Pouchard 2, and Christian Cros 2

1 General Electric Company Research and Development Center, Schenectady, New York
2 Service de Chimie Minérale de la Faculté des Sciences de Bordeaux, France

The crystal structure of two new cubic phases in the silicon-sodium system have been solved from their x-ray diffraction patterns. Both structures are of the clathrate type found for gas hydrates, consisting of tetrahedral networks which are combinations of pentagonal dodecahedra with 14-face polyhedra in one case and with 16-face polyhedra in the other case. There is strict correspondence between the silicon positions and the oxygen positions of the hydrate structures. For one compound, Na8Si46, the centers of all polyhedra are occupied by sodium atoms. For the other compound, there occurs only partial occupancy of the polyhedral cages.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Absence of Neutral Alkali Atoms in Rhodizite.
G. Donnay, G. Donnay, A. N. Thorpe, F. E. Senftle, and R. Sioda (1966)
Science 154, 889-890
   Abstract »    PDF »
Rhodizite: Structure and Composition.
M. J. Buerger, M. J. Buerger, and K. Taxer (1966)
Science 152, 500-502
   Abstract »    PDF »


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