One-step synthesis of single-phase (Co, Mg, Ni, Cu, Zn) O High entropy oxide nanoparticles through SCS procedure: Thermodynamics and experimental evaluation

Evaluation of the thermodynamic aspects of the synthesis process offers a better insight through the single-step synthesis of high entropy oxide particles. The thermodynamic calculations were used to specify the required conditions (fuel type and fuel amount) for the synthesis of single-phase (Co, Mg, Ni, Cu, Zn) O particles. Moreover, the impact of the activities coefficients alteration on the formation of (Co, Mg, Ni, Cu, Zn) O single-phase was calculated. Experiments were carried out using glycine, urea, citric acid, and hexamine at various fuel to oxidizer ratios (φ = 1.05, 1, 0.95, and 0.9) to explore the effect of fuel type and φ values on physicochemical properties of final product. Obtained results indicated that single-phase (Co, Mg, Ni, Cu, Zn) O powders were synthesized using glycine at the fuel-lean condition. Prepared powders exhibited promising crystallinity (59%), the thermal stability of 400 °C, 28 nm particle size, high porosity, and 15 m2. g−1 surface area.