Abstract

Viscosities of three kinds of halide liquids were measured at temperatures near the glass transition and above the melting point. The liquids and glasses investigated were two fluoroaluminates, a cadmium mixed halide, cadmium halide phosphate and gallium–indium fluoride glasses. These glasses were designed for a variety of rare-earth doped fibre amplifiers and lasers. The cadmium mixed halide glass has a strong non-Newtonian behaviour, while near-Newtonian behaviour was observed in fluoroaluminate liquids. The implications of these results on fibre drawing and low-loss fibre fabrication are discussed. Viscosity data were fitted to models and the appropriateness of the fits is discussed.

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