Experimental study of the phase relationships in the SrO-SiO2 system

The phase relationships in the SiO2-SrO system were determined experimentally using the quenching technique in the temperature range between 1573 K (1300 °C) and 1898 K (1625 °C). The phases in the quenched samples were examined and identified using light optical microscopy (LOM), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). The presence of solid phases and their nature were further confirmed using X-ray Diffraction (XRD). Based on the experimental results, the phase diagram was constructed. The phase diagram shows a congruent melting of the SrSiO3 at 1840 K (1567 °C). The eutectic between the SrSiO3, SiO2 and liquid happens at 1608 K (1335 °C) and 67 mol% SiO2 and the eutectic between the SrSiO3, Sr2SiO4 and liquid at 1835 K (1562 °C) and 46.5 mol% SiO2.