Experimental Glass Melting Techniques
The composition range in which glass formation can take place in most systems, depends on the cooling rate from a temperature above the liquidus to the glass transformation temperature. Therefore, any study of a particular system must refer to a uniform cooling rate. In addition, for practical purposes, it is necessary to define the smallest usable volume. This varies from fractions of a gram (in reflective beads) to many kilograms (for massive optics, etc.) Turnbull1 states that any body, however formed, which exhibits diffraction behaviour consistent either with the continuous random model or with a microcrystalline model in which the average crystallite size appears to be no greater than about five molecular diameters, will be considered to be a glass. There are many methods to form glasses but glass formation referred to here will be confined to cooling from an inorganic melt of the same composition as the resultant glass.
KeywordsGlass Formation Optical Glass Index Homogeneity Single Oxide Glass Preparation
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