Abstract
The principle and method which have previously been used to estimate the immiscibility boundary of a ternary silicate system are also applicable to the estimation of the immiscibility boundaries of quaternary and higher order multi-component silicate glasses. The method is based upon the regular mixing equations derived for quaternary and multi-component silicate systems and the superposition principle of the immiscibility boundary. As an example, the Li 2ONa 2OK 2OSiO 2 system is used to demonstrate the success of the estimation method. Expressions for higher order multi-component silicate glasses are also shown. A polynomial expression is obtained for the master curve of the normalized immiscibility boundary to facilitate the immiscibility temperature estimation.
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