Тип публикации: статья из журнала
Год издания: 2026
Идентификатор DOI: 10.1134/S0036023625603629
Ключевые слова: phase diagram, physicochemical analysis, Redlich–Kister polynomial, structure, unit cell parameters of phases
Аннотация: The Y2OSe2 and Y2O2Se phases should be considered as candidate phosphor and functional ceramic hosts. More than 20 samples have been studied in the Y2Se3–Y2O3 system and characterized by X‑ray powder diffraction (XRD), differential thermal analysis (DTA), visual thermal analysis (VTA), scanning electron microscopy (SEM), microstructure observation (MS), and microhardness measurements. A phase diagram of the Y2Se3–Y2O3 system has been designed for the first time using physicochemical analytical methods. Four invariant phase transformations occur in the system. The Y2OSe2 phase is orthorhombic (<i>Pnma</i>), has the microhardness <i>H</i> = 490 ± 30 HV, and melts incongruently at 1470 ± 15°C to form Y2O2Se crystals and a melt. The Y2O2Se phase is trigonal (<i>P</i>-3<i>m</i>1), has the microhardness <i>H</i> = 780 ± 25 HV, and melts congruently at 2000 ± 20°C. Two eutectic points exist in the system: (1) 0.505Y2Se3 : 0.495Y2OSe2 (16.5 mol % Y2O3), melting at 1350 ± 10°C; and (2) 0.615Y2O2Se : 0.385Y2O3 (79.5 mol % Y2O3), melting at 1790 ± 20°C. The Y2Se3, Y2OSe2, and Y2O2Se phases have similar morphologies in powders and in melt-crystallized primary crystals. The liquidus line of the system has been calculated by the Redlich–Kister polynomial and verified by thermoanalytical experiments.
Журнал: Russian Journal of Inorganic Chemistry
Выпуск журнала: Т.71, №6
Номера страниц: 776-789
ISSN журнала: 00360236
Место издания: Moscow
Издатель: Pleiades Publishing, Ltd.