Experimental Investigation of Phase Equilibria of the Ho-Ir-O\nTernary System at 1073 K

0574319 - ÚFM 2024 RIV CH eng J - Článek v odborném periodiku
Homolová, V. - Čiripová, L. - Zobač, Ondřej - Zemanová, Adéla - Falat, L.
Experimental Investigation of Phase Equilibria of the Ho-Ir-O
Ternary System at 1073 K.
Materials. Roč. 16, č. 15 (2023), č. článku 5406. E-ISSN 1996-1944
Institucionální podpora: RVO:68081723
Klíčová slova: Ho-Ir-O system * phase diagram * phase equilibria * isothermal section * eutectic microstructur
Obor OECD: Thermodynamics
Impakt faktor: 3.4, rok: 2022
Způsob publikování: Open access
https://www.mdpi.com/1996-1944/16/15/5406

An experimental study of the phase equilibria of the Ho-rich part of the Ho-Ir-O ternary system at 1073 K by means of x-ray diffraction, differential scanning calorimetry, and scanning electron microscopy has been carried out. Ho-hcp and four binary compounds, namely Ho3Ir, Ho5Ir2, Ho5Ir3, and Ho2O3, were identified in the Ho-Ir-O model alloys after long-term annealing (350-1220 h). No solubility of iridium in Ho2O3 oxide and Ho-hcp was observed. No ternary phase was found. Based on the experimental results, an isothermal section of the Ho-rich part of the Ho-Ir-O system at 1073 K was constructed. In addition, the microstructure of as-cast alloys was studied. An irregular eutectic consisting of faceted Ho-phase in Ho3Ir phase was observed in the alloys with Ho-hcp + Ho3Ir + Ho2O3 phase composition, and the temperature of the eutectic reaction Ho-hcp + Ho3Ir & LRARR, liquid was determined.
Trvalý link: https://hdl.handle.net/11104/0344663