Abstract
Despite obvious differences, the structures of silicate glasses and amorphous binary alloys display some remarkable similarities. In particular, it can be argued by analogy with the amorphous transition metal-metalloid alloys, that the structure in the dense-packed regions of alkali and alkaline earth silicates exerts a significant influence on the overall structure of the glass. Preliminary results are presented of an investigation of the environment of typical ‘network-modifying’ cations in silicate glasses by neutron scattering with isotopic substitution of Ca and Li. The immediate neighbourhood of each cation appears to be ordered with a suggestion that organisation extends to second-neighbours, at least.
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