PHASE EQUILIBRIA IN THE La2O3-Lu2O3-Ho2O3 SYSTEM AT 1500 °С

Authors

DOI:

https://doi.org/10.15421/jchemtech.v32i3.303869

Keywords:

phase equilibria, lanthana, lutetia, holmia, isothermal section, solid solutions, lattice parameters

Abstract

The phase equilibria in the La2O3–Lu2O3–Ho2O3 ternary system at 1500 °C were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM) in the whole concentration range. La2О3, Lu2О3, and Ho2О3 (99.99 %) were used as starting substances. The experimental samples were prepared with a concentration step of 1–5 mol%. The oxides were dissolved in HNO3 (1 : 1) followed by evaporation of the solutions and decomposition of nitrates at 800 °C for 2 hours. The samples were heat treated at 1500 °C (for 70 h) in air. The phase composition of the test samples studied by X-ray diffraction (XRD, DRON-3), microstructural phase and electron microprobe X–ray (Superprobe-733, JEOL, Japan, Palo Alto, CA) analyses. Solid solutions based on various polymorphic forms of original oxides and ordered LaLuO3 phase were detected in the system. No new phases were found in the system. The isothermal cross-sections of the La2O3–Lu2O3–Ho2O3 phase diagram at 1500 °C are characterized by the presence of four single-phase (A-La2O3, B-La2O3, R, C-Lu2O3 (Ho2O3)),  five two-phase (C + R, A + R, B + A, B + R, B + C) and two three-phase ( A + R+ B, B + R + C) regions. Solubility limits are determined and concentration dependences of periods also lattice parameters of the unit cell of phases formed in the system are constructed. The range of homogeneity of solid solutions based on the R-phase extends from 0 to 8 mol% Ho2O3 and from ~47 to 54 mol% La2O3 at 1500 °C. Lu and Ho oxides form an continuous series of C-REE oxide solid solutions.

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Published

2024-10-20

Issue

Vol. 32 No. 3 (2024): Journal of Chemistry and Technologies

Section

Physical and inorganic chemistry

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