Park, Taesung Javadinejad, Hamid Reza Kim, Young-Kuk Chang, Hye Jung Choi, Haneul Woong, Choo Ashong, Andrews Nsiah Lee, Youn Seoung Kim, Jeoung Han 2024-01-19T13:00:54Z 2024-01-19T13:00:54Z 2022-01-10 2022-02 0925-8388 https://pubs.kist.re.kr/handle/201004/115801 (Y-La-Ce-Nd-Gd)(2)O3+beta high-entropy rare earth oxides (HE-REOs) were synthesized using both mechanochemical (ball milling) and chemical (sol-gel) methods. Energy-dispersive X-ray spectroscopy revealed that the compositional uniformity of the as-synthesized powders was the highest in the sol-gel process, followed by that in wet milling and dry milling. The sol-gel process was advantageous because it yielded oxide powders with the best compositional uniformity and required a lower annealing temperature to obtain a single phase compared to the ball-milled powders. However, following heat treatment at 1600 degrees C, similar chemical uniformity and physical properties of the oxides were obtained regardless of the synthesis method. The formation of single-phase Ia3 structures was confirmed by X-ray diffraction and Rietveld refinement analyses. A detailed transmission electron microscopy analysis revealed that a Fm3m structure formed at low temperatures. The thermodynamic parameters of high-entropy alloys, high-entropy transition metal oxides, and HE-REOs were calculated and compared. This analysis confirmed that the HE-REOs synthesized in the present study had very high phase stability. (C) 2021 Elsevier B.V. All rights reserved. English Elsevier BV Effect of processing route on the crystal structure and physical properties of bixbyite high-entropy oxides Article 10.1016/j.jallcom.2021.162108 1 Journal of Alloys and Compounds, v.893 Journal of Alloys and Compounds 893 N scie scopus 000711349800002 2-s2.0-85117096107 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article LOW-TEMPERATURE SYNTHESIS RARE-EARTH SOL-GEL PARTICLE-SIZE TENSILE PROPERTIES MICROSTRUCTURE ALLOY DESIGN High-entropy oxide Rare earth oxide Crystal structure Ball mill Sol-gel Phase stability