The Measurement of the Devitrification Characteristics of Glass

JSGT 1952 V36 T275-T286

The devitrification characteristics of a glass are defined, and a detailed description given of two methods developed for the study and measurement of these characteristics. In the first method, the rate of growth of the crystals formed during the early stages of the devitrification process is measured on samples which have been rapidly cooled. The method has the following advantages over procedures hitherto employed: greater speed; use of small sample; more complete information; and greater accuracy. In the second method, a simple high-temperature microscope is used, and measurements of the rate of crystal growth can be made while the crystals are actually growing. This method is of particular value for studying the devitrification of opal glasses.

A. J. Milne