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- W2028016844 abstract "Abstract On first acquaintance, oxide glasses, amorphous semiconductors and metallic alloy glasses appear to represent structurally distinct families. The former range from covalent “framework” materials with very open structures to mixed oxides with considerable ionic bonding. Amorphous alloys, on the other hand, appear to be essentially close-packed, with bonding dominated by delocalised “metallic” orbitals. There are, nonetheless, definite similarities in the structural questions appertaining to each class of amorphous solid. For example, the notion of local structural units — a concept generally accepted in covalent glasses but contentious in amorphous alloys. Where this description is appropriate, it then becomes necessary to define the method of interconnection and the detailed network topology. In this paper, an attempt is made to delineate current structural problems in each class of materials and to present a review of relevant experimental investigations. Structural information is dominated by the results of scattering studies (neutrons or X-rays), with a recent, growing emphasis being placed on extraction of partial structure factors and accurate comparison with atomic models. EXAFS allows a more detailed investigation of the surroundings of specific atoms, even in complex systems such as oxides and chalcogenides, Mossbauer and NMR spectroscopy have provided new information on the symmetry of first-neighbour coordination shells — particularly in metallic systems. The results of experiment and comouter-simulations appear to reinforce the view that structure in amorphous materials is marked less by its uniformity than by its variability. It does not seem possible to provide a simple, singular, definition of what constitutes a glass (in terms of random networks, for example) or why some form more easily than others. But a common set of principles and parameters is emerging which allow the various structures adopted by glasses to be investigated, measured and described." @default.
- W2028016844 created "2016-06-24" @default.
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- W2028016844 date "1982-08-01" @default.
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- W2028016844 title "The local structure of oxide and metallic glasses☆" @default.
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- W2028016844 doi "https://doi.org/10.1016/0167-5087(82)90176-4" @default.
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