The structure of liquid and glassy materials is a formidable problem to solve because the atomic sites are topologically disordered and the presence of two or more chemical species adds further complexity.  In this talk, some new in-roads are reported that have emanated from the application of neutron and x-ray diffraction methods.  Specifically, it is found that the topological and chemical ordering are both described by at least two different length scales at distances greater than the nearest-neighbour.  The interplay between the ordering on these length scales and the physical properties of liquid and glassy networks is discussed.

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1. Partial Structure Factors of Molten and Glassy Zinc Chloride