Abstract
Viscosity, density, and electrical resistivity were determined on three series of molten alkaline‐earth borate glasses, each containing 3 mole % of potassium oxide. A previous investigation of these properties of the binary alkaline‐earth borates was limited by the formation of two immiscible liquids at low alkaline‐earth oxide concentrations. To overcome this difficulty 3 mole % of K2O was added to each composition. The properties of this new series of glasses were compared with the previous work. The densities at room and elevated temperatures were in the order BaO > SrO > CaO on a mole per cent basis. The reverse order was noted for the viscosity data. The electrical resistivity decreased with increasing concentration of alkaline‐earth oxide at 1000°C. and at 1100°C. but increased at 800°C. and at 900°C.
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