Abstract
A vacuum fusion technique was applied to determine the solubility of water in liquid oxides. Reproducibility of determined hydrogen in liquid oxides was usually ±4 to 5 ppm for samples containing. about 50 ppm hydrogen. Liquid oxides were equilibrated with the gas mixture of argon and water vapour in the range of temperature from 1500°C to 1600°C. In the lime-silica system, a minimum of water solubility was observed near the metasilicate composition. The effects of addition of P205, B203, Ge02, Al203 and TiO2 respectively to the CaO-Si02 system (%CaO/%SiO2=0.59) on the solubility of waterwere studied at 1500°C. The addition of acid oxides such as P205, B203 and Ge02 increases the solubility of water, but amphoteric oxides as Al205 and TiO2 decrease the solubility of water. A minimum of water solubility was observed at approximately 20 moles percent of AlO1.5 in the CaO-Si02-Al208 system. It was found that the effect of an addition of acid or an amphoteric oxide on the solubility of water might be closely related to the ion-oxygen attraction of cation in oxide.
