Equilibrium phase relations in the Na 2 O-CaO-SiO 2 system at o50 wt% SiO 2 concentrations have been experimentally investigated at temperatures between 12001 and 14001C. The liquidus temperature was determined with differential scanning calorimetry. The equilibrated samples were quenched with high-pressure nitrogen, and examined with electron probe X-ray microanalysis and X-ray diffraction. Based on the experimental results, the liquidus surface projection has been constructed for this temperature range. Six primary phase fields, Ca
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