Network properties of crystalline polymorphs of silica

A method is presented for the study of structure in tetrahedrally coordinated networks. The motivation for this approach is that the now customary description of silica glasses as a continuous-random network, derived from Zachariasen's work, is no longer adequate for description of the structur...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1990-10, Vol.124 (2), p.242-253
Main Authors: Marians, Carol S., Hobbs, Linn W.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
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Summary:A method is presented for the study of structure in tetrahedrally coordinated networks. The motivation for this approach is that the now customary description of silica glasses as a continuous-random network, derived from Zachariasen's work, is no longer adequate for description of the structurally distinct states of glass that are presently being investigated. The local structure of the network under consideration is studied, giving a definition of that part of the structure which ought to be considered the local environment of a particular tetrahedron in the network. When these definitions are applied to the crystalline polymorphs, it is found that each of them can be distinguished without reference to either symmetry or unit cells.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(90)90269-R