The Creation of Multicomponent Octahedral Crystals with Spinel Structure Using Solid-Phase Synthesis in the Al<sub>2</sub>O<sub>3</sub>-BaO-CuO-Fe<sub>2</sub>O<sub>3</sub>-Mn<sub>2</sub>O<sub>3</sub>-NiO-SrO-TiO<sub>2</sub>- ZnO and Al<sub>2</sub>O<sub>3</sub>-BaO-CuO-Fe<sub>2</sub>O<sub>3</sub>-NiO-SrO-TiO<sub>2</sub>-WO<sub>3</sub>- ZnO Systems

Abstract

This paper presents the results of an experimental study of the possibility of high-entropy oxide phases creation using the of solid-phase synthesis method in the Al2O3–BaO–CuO–Fe2O3–Mn2O3–NiO–SrO–TiO2–ZnO and Al2O3–BaO–CuO–Fe2O3–NiO–SrO–TiO2–WO3–ZnO systems. As a result of the study, a microcrystalline octahedral multicomponent phase was found in the crystallized sample. Judging by the composition, this phase has a spinel structure and is characterized (judging by the components concentrations and its ratio) by rather high values of the mixing configurational entropy. It is shown that barium, strontium and tungsten are not included in this phase in appreciable amounts. The obtained results indicate the possibility of synthesizing high-entropic spinels using these Al2O3–CuO–Fe2O3–Mn2O3–NiO–TiO2–ZnO systems.