Poulain and Lucas discovered heavy metal fluoride glasses (HMFGs) based on zirconium fluoride, also called fluorozirconate fluoride glasses, accidentally in 1975 at the University of Rennes. In general, the typical fluoride glass has a glass transition temperature, Tg, four times less than silica, is considerably less stable, and has practical failure strains of only a few percent compared to silica's greater than 5%. While an enormous number of multicomponent fluoride glass compositions have been fabricated, comparably few have been drawn into fiber. This is because the temperature range for fiber drawing is normally too small in most HMFGs to permit fiberization of the glass.
Online access to SPIE eBooks is limited to subscribing institutions.