Abstract: Phase equilibrium relations in the system Na2O‐GeO2 have been determined using standard quenching techniques supplemented by differential thermal analysis. Two congruently melting compounds, Na2O·GeO2 and 2Na2O·9GeO2, exist; the melting points are 1103°± 15°C and 1073°± 3°C, respectively. The eutectic temperature between GeO2 and 2Na2O·9GeO2 is 950°±f 10°C at 94.5 wt GeO2. The eutectic temperature between 2Na2O · 9GeO2 and Na2O·GeO2 is 790° f 10°C at about 75 wt% GeO2. Both the refractive index and the density of glasses in th...
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Topics: 
Mineralogy
Crystallography