Abstract
Given that glasses are not in thermodynamic equilibrium, they may form a continuity of structures depending on small variations in fabrication. However, by analogy with crystallography, the current meaning of polyamorphism refers to the existence of two (or more) very different forms of an amorphous material which are linked via a first order phase transition. The arguments for this rare phenomenon are based largely on the success of two state models in explaining the density maxima (and other theromodynamic properties) that occur in some materials. Glasses currently termed "polyamorphic" include germania, silica, water, yittra-alumina, and triphenolphosphite (TPP), among others. The study of these glasses has formed a significant part of the research on the Glass, Liquid and Amorphous Materials Diffractometer (GLAD) at IPNS in the past few years.
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