Experimental Determination of Phase Equilibria in the REM2O3-SiO2 (REM = Y/Yb/La) Systems at Elevated Temperature


Phase relations in the REM2O3-SiO2 (REM = Y/Yb/La) systems have been studied using the equilibration/quenching/scanning electron microscopy (SEM)-electron probe microanalysis (EPMA) technique. The solvus and liquidus between 1400°C and 1650°C have been determined. The results obtained in this study show that a maximum of 0.57 wt.% Yb2O3 can dissolve in SiO2 phase, while the maximum solubility of La2O3 and Y2O3 in SiO2 phase was 0.22 wt.% and 0.07 wt.%, respectively. Correspondingly, SiO2 shows low solubility in La2Si2O7, and nearly does not dissolve in Y2Si2O7 or Yb2Si2O7. No liquid phase was detected in the Y2O3-SiO2 or Yb2O3-SiO2 system in the temperature range of interest. One oxide liquid phase comprising 39.27 wt.% SiO2 and 59.07 wt.% La2O3 was found in the La2O3-SiO2 system sample equilibrated at 1653°C, revealing that the eutectic point temperature between La2Si2O7 and SiO2 is located between 1600°C and 1653°C. Results of this study were compared with previous observations, revealing significant differences.

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The research was financially supported by the National Solid Waste Project (No. 2018YFC1902503) and Major Projects in Jiangxi Province (No. S2016YFSFG0009). The authors acknowledges the Analytical Center in Australia National University for EPMA analysis of the specimens. Mr. Chen JianBo’s help with the experiments is also warmly acknowledged.

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Xia, L., Sukhomlinov, D., Ye, F. et al. Experimental Determination of Phase Equilibria in the REM2O3-SiO2 (REM = Y/Yb/La) Systems at Elevated Temperature. JOM 73, 63–71 (2021). https://doi.org/10.1007/s11837-020-04473-1

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