Liquid Regions of Lanthanum-Bearing Aluminosilicates

Yandong Li; Tongsheng Zhang; Yefeng Feng; Chengjun Liu; Maofa Jiang

doi:10.3390/ma13020450

Liquid Regions of Lanthanum-Bearing Aluminosilicates

Materials (Basel). 2020 Jan 17;13(2):450. doi: 10.3390/ma13020450.

Authors

Yandong Li^{1

2}, Tongsheng Zhang³, Yefeng Feng¹, Chengjun Liu², Maofa Jiang²

Affiliations

¹ Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM), Yangtze Normal University, Chongqing 408100, China.
² Key Laboratory of Ecological Utilization of Multi-Metallic Mineral of Education Ministry, Northeastern University, Shenyang 110819, China.
³ National Center for International Research of Clean Metallurgy, Central South University, Changsha 410083, China.

Abstract

The Al₂O₃-SiO₂, La₂O₃-Al₂O₃, and La₂O₃-SiO₂ binary phase diagrams were estimated by Redlich-Kister expression. La_4.67Si₃O₁₃ (=La_4.67(SiO₄)₃O) was introduced to improve the existing phase diagrams. The Al₂O₃-SiO₂-La₂O₃ ternary phase diagram extrapolated by Kohler method was optimized. Then, the liquidus of Al₂O₃-SiO₂-La₂O₃ system at 1600 °C was compared with Al₂O₃-SiO₂-RE₂O₃ (RE = Rare Earth Elements) systems and experimental results in other literature. The high temperature experiments were conducted in the tube furnace at 1500 °C. Then the field emission scanning electron microscope (FE-SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) were employed to verify the calculated liquid region and precipitates phase at 1500 °C. Moreover, the liquidus of binary systems were compared with FactSage results and experiments. The optimized ternary phase diagram shows the relatively reliable region of liquid phase, and it is significant to the seal glass of solid oxide fuel cells and other fields being related to RE containing silicates.

Keywords: CALPHD (Computer Coupling of Phase Diagrams and Thermochemistry); glass; phase diagram; rare earth.

Abstract

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