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Viscosity of lead bismuth gallate glasses containing minor addition of silica and germania
Abstract
Heavy metal oxide glasses with and without minor additions of Silica and Germania in the system PbO-Bi203-Ga203 have been prepared which have potential applications for infrared fibers. Viscosity measurements using penetration viscometry were first carried out on sample of glass No. 711 provided by National Bureau of Standards (NBS) over a range of 107 to 1010 Pa.s and showed good agreement with NBS data with a mean error of 1.35% using modified-Nemilov equation. The viscosity of glasses studied fell sharply about three orders of magnitude in a temperature interval of less than 45 degrees (on Celsius scale). The results have been discussed in relation to activation energy for viscous flow and the fragility of the melts has been compared.
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