High entropy oxide systems based on rare earth elements

16th International Conference of Students and Young Scientists "Prospects of Fundamental Sciences Development"

自然科学（总论）

Sachkov, V.I.^1 ; Nefedov, R.A.^1 ; Amelichkin, I.V.^1

Innovation and Technology Center, National Research Tomsk State University, 36 Lenin Street, Tomsk

634050, Russia^1

关键词: Complex compositions;    Configurational entropy;    Key factors;    Mixing enthalpy;    Nano-sized powder;    Oxide systems;    Rare earth oxide;    X-ray phase analysis method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/597/1/012005/pdf
DOI  :  10.1088/1757-899X/597/1/012005

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

In this paper we synthesized high entropy oxide system (Sc0.2Ce0.2Pr0.2Gd0.2Ho0.2)2O3δ by precipitation of hydroxides from REE nitrates aqueous solutions and annealing the mixture at 800 °C. It is possible to obtain the various forms of simple and complex composition based on the rare earth oxides, including oxides in the form of nanosized powders. The main idea of obtaining HEOS comes from the field of high-entropy alloys. The interconnection between configurational entropy and mixing enthalpy is a key factor for determining phase transformations. The phase composition, structure, and surface morphology of the obtained powders were investigated by scanning electron microscopy and X-ray phase analysis methods.