Abstract
In earlier work, a prediction method of the immiscibility boundary of a ternary silicate glass system was developed involving two known binary immiscibility boundaries and a measured immiscibility temperature of one ternary glass composition. In the present work, the method is extended to the case where one of the two binary immiscibility boundaries is not known and is applied as an example to ternary silicate systems containing K2O. First, the immiscibility boundary of the system K2O‐SiO2 is estimated by measuring the immiscibility temperatures of three glasses in the system K2O‐Li2O (or Na2O)‐SiO2. Using this result the immiscibility boundaries of the systems K2O‐Li2O‐SiO2, K2O‐Na2O‐SiO2, and K2O‐BaO‐SiO2 are estimated. The results agree reasonably well with the experimentally determined immiscibility temperatures at selected compositions.
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