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Phase Equilibria in the System Nb2O5-MgO-SiO2 at 1673 K and 1523 K in Air

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Abstract

Phase relationships of the Nb2O5-MgO-SiO2 system in equilibrium at 1673 K and 1523 K in air have been investigated by the high-temperature equilibration/quenching method. The compositions of equilibrium phase were determined by electron-probe X-ray microanalysis (EPMA) and X-ray diffraction (XRD). In this study, no ternary compounds were observed. The isothermal section of the system at 1673 K was triangulated into seven three-phase regions: SiO2-Nb2O5-Mg2/3Nb34/3O29, SiO2-Mg2/3Nb34/3O29-MgNb2O6, SiO2-MgSiO3-MgNb2O6, MgO-Mg2SiO4-Mg4Nb2O9, Mg2SiO4-MgNb2O6-Mg5Nb4O15, MgSiO3-Mg2SiO4-MgNb2O6, and Mg2SiO4-Mg5Nb4O15-Mg4Nb2O9. Similarly, the isothermal section at 1523 K was triangulated into six three-phase regions: SiO2-Nb2O5-MgNb2O6 region, SiO2-MgSiO3-MgNb2O6 region, MgO-Mg2SiO4-Mg4Nb2O9 region, Mg2SiO4-MgNb2O6-Mg5Nb4O15 region, MgSiO3-Mg2SiO4-MgNb2O6 region, and Mg2SiO4-Mg5Nb4O15-Mg4Nb2O9 region. The determination of the Nb2O5-MgO-SiO2 ternary system further enriches the thermodynamic databases of silicates and niobates.

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Acknowledgements

The authors would like to acknowledge the support received from the National Natural Science Foundation of China (No. 92062223).

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Authors and Affiliations

  1. Changsha Research Institute of Mining and Metallurgy Co., Ltd, Changsha, 410012, Hunan, China

    Mengjie Ran, Guoxing Ren, Wensheng Han & Wen Chen

  2. Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Songwen Xiao

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Ran, M., Ren, G., Xiao, S. et al. Phase Equilibria in the System Nb2O5-MgO-SiO2 at 1673 K and 1523 K in Air. JOM 75, 3162–3169 (2023). https://doi.org/10.1007/s11837-023-05883-7

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