Abstract
In the past five years, glass formation has been observed in many chemical systems involving zirconium tetrafluoride1–5. These ionic glasses were unexpected as no theory of glass formation had predicted their occurrence. Most common glasses can be explained by the Zachariazen theory6 which gives criteria for vitreous structures with highly directed three-dimensional bond arrays, according to energy and kinetic considerations. However, the theory does not encompass some new amorphous systems such as amorphous germanium or the new ionic glasses. I review here the structural and energetic conditions for glass formation in ionic systems with particular reference to fluoride glasses.
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