Parameters of Glycine–Nitrate Synthesis of NiCo 2 O 4 Spinel

The effects of the glycine content (ϕ) and annealing temperature on the phase composition and morphology of NiCo 2 O 4 spinel samples manufactured by solution combustion synthesis (SCS) reactions were studied. With small amounts of glycine in the precursor, the major phase in the thus-prepared samples was nickel cobalt oxide; when ϕ ≥ 0.7 metallic nickel was in addition formed in the samples, and it was only at ϕ ≥ 1.4 that Ni x Co 3 – x O 4 spinels, where x < 1, started to form. The highest-nickel sample (Ni 0 . 72 Co 2.22 O 4 ) was prepared at ϕ = 2.2. An increase in annealing temperature from 400 to 700°С was accompanied by a decrease in nickel amount in the Ni x Co 3 – x O 4 spinel crystal structure to x = 0.07–0.13 and an increase in nickel amount in double oxide samples.