Abstract
Solution-combustion synthesis of NixCo3 – xO4 (x < 1) spinels from aqueous solutions of nickel and cobalt nitrates using citric acid–glycine mixtures as a dual fuel was investigated by XRD and SEM. A decrease in combustion temperature at minimal amounts of glycine (φgl = 0.5) and citric acid (φcitr = 0.2–0.3) afforded for the synthesis of NiCo2O4 spinel after heat treatment of as-synthesized powders at 400°C for 20 h. An increase in the fuel content of starting solutions (for Σφ = φgl + φgl > 0.9) led to an increase in reaction temperature and the formation (after annealing at 400°C) of non-stoichiometric spinels NixCo3 – xO4 (x < 1) with an admixture of double oxides NiyCo1 – yO (y = 0.71–0.77).
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This research was carried out in the frame of state assignment for the Institute of Solid State Chemistry (themes АААА-А19-119031890026-6 and AAAA-A18-118020190112-8).
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Zhuravlev, V.D., Dmitriev, A.V., Vladimirova, E.V. et al. Off-Stoichiometric NixCo3 – xO4 (x < 1) Spinels by Solution-Combustion Synthesis Using Citric Acid–Glycine Mixtures as a Dual Fuel. Int. J Self-Propag. High-Temp. Synth. 30, 170–174 (2021). https://doi.org/10.3103/S1061386221030122
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DOI: https://doi.org/10.3103/S1061386221030122