Experimental investigation of liquidus and phase stability in the BaO–SiO 2 binary system

Abstract The liquidus in the SiO2-rich corner was experimentally constructed at temperatures from 1400 °C to 1640 °C. The phase compositions of the liquidus studied were obtained by analyzing the quenched samples employing Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDS) and Electron Probe Micro-Analyzer (EPMA). The phase relationships of the stoichiometric compounds at 1200 °C and 1250 °C were determined by X-ray powder diffraction (XRD). Phase diagram of the BaO–SiO2 binary system was calculated based on the MTOX oxide database. The present experimental data were compared with the calculated phase diagram and showed a good agreement.