ВЗАЄМОДІЯ ОКСИДІВ ЛАНТАНУ, ЛЮТЕЦІЮ ТА ІТЕРБІЮ ЗА ТЕМПЕРАТУРИ 1500 °С

Olga V. Chudinovych; Olexandr I.  Bykov; Anatoly V. Samelyuk

doi:10.15421/jchemtech.v29i4.238943

Authors

Olga V. Chudinovych Frantsevich Institute for Problems in Materials Science NAS of Ukraine, Ukraine
Olexandr I. Bykov Frantsevich Institute for Problems in Materials Science NAS of Ukraine, Ukraine
Anatoly V. Samelyuk Frantsevich Institute for Problems in Materials Science NAS of Ukraine, Ukraine

DOI:

https://doi.org/10.15421/jchemtech.v29i4.238943

Keywords:

phase equilibria; Lanthana; Lutetia; Ytterbiа; lattice parameters

Abstract

The phase relation in the La₂O₃–Lu₂O₃–Yb₂O₃ ternary system at 1500 °C were studied by X-ray diffraction (XRD) and scanning electron microscopy in the overall concentration range. The test samples of different compositions have been prepared from nitrate acid solutions by evaporation, drying, and calcinations at 800 ºC. To study phase relationships at 1500 °C the as-repared samples were thermally treated in two stages: at 1100 °C and then 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 (LaYbO3) phases were detected in the system. No new phases were found in the system. The isothermal section of the phase diagram for the La₂O₃–Lu₂O₃–Yb₂O₃ system has been developed. It was established that in the ternary La₂O₃–Lu₂O₃–Yb₂O₃ system there exist fields of solid solutions based on hexagonal (A) modification of La₂O₃, cubic (C) modification of Y₂O₃ and Lu₂O₃, as well as perovskite-type ordered phases of orthorhombic symmetry LaLuO₃ and LaYbO₃ (R). The refined lattice parameters of the unit cells for solid solutions and microstructures of the definite field of compositions for the systems solid were determined. The La₂O₃–Lu₂O₃–Yb₂O₃ system forms an infinite series of solid solutions based on the perovskite-type phase. The maximum solubility of Lu₂O₃ in the R-phase is ~6 mol. % along section Lu₂O₃–(50 mol. % La₂О₃– 50 mol. % Yb₂О₃). The region of homogeneity of the R-phase extends from 46 to 56 mol. % La₂O₃ in the cross section La₂O₃–(50 mol.% Lu₂O₃–50 mol.% Yb₂O₃)

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