THE REGULARITIES OF METASTABLE LIQUID PHASE SEPARATION OF SODIUM, POTASSIUM AND RUBIDIUM BOROSILICATE GLASSES: LONER TEMPERATURE BOUNDARIES AND THREE-PHASE IMMISCIBILITY

摘要

A systematic investigation of the liquid-liquid immi-scibility in sodium, potassium and rubidium borosilicate systems (NBS, KBS and RBS, respectively) was carried out using a differential thermal analysis (DTA). It was found that immiscibility regions in this systems have a lower temperature boundaries. Isothermal curves of lower surfaces were constructed, upper surfaces locations were refined. Three-phase region was found to exist in NBS system; its upper and lower boundaries were determined. Juxtaposition of NBS, KBS and RBS immiscibility regions enables us to differentiate "anionic" and "cationic" characteristic properties of alkali borosilicate immiscibility.