| Abstract Scope |
High entropy oxides (HEOs), particularly spinel-structured ones, have attracted growing interest due to their thermal stability, compositional flexibility, and potential in catalysis, energy storage, and magnetic systems. Among them, (CoCrFeMnNi)₃O₄ is notable for its equimolar multicationic composition and entropy-driven phase stabilization. In this work, (CoCrFeMnNi)₃O₄ was synthesized using solution combustion synthesis (SCS) with nitrate-based metal precursors and three different fuels: glycine, urea, and citric acid. The fuel-to-oxidizer ratios were systematically varied to understand their influence on the combustion reaction and product formation. Post-synthesis calcination was carried out at 800°C, 900°C, and 1000°C to enhance crystallinity and phase purity. Characterization was performed using X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and thermogravimetric analysis. The results revealed that both the type and amount of fuel play a critical role in determining the phase formation and microstructure. This study provides efficient approach for producing homogeneous spinel HEOs through tunable combustion parameters. |