Abstract
The formation of glass in the system CaO-Al2O3-CaF2 has been investigated in sealed platinum capsules having about one atmosphere pressure of AlF3 vapour. Transparent colourless glass could be obtained in the low-fluoride moderate-alumina region of the system (Al2O3 35 to 60%, CaF2 0 to 20%). With the concentration of CaF2 exceeding 20% considerable amount of quench crystals of CaF2 appeared in the glass. Moderate-alumina low-lime melts containing more than 35% CaF2 occur in an immiscibility zone. At the low-fluoride periphery of the liquid immiscibility zone a small zone of metastable liquid immiscibility has been found. The results of electron microscopic and infra-red spectroscopic studies of a few selected glasses have been analysed in combination with the molar refractivity data to reflect upon the co-ordination characteristics of aluminium in these glasses.
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