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The process of phase formation in the system of oxides NiO–CuO–Fe2O3–Cr2O3 was studied. It was found that in the presence of mineralizer the process resulting in the formation of structure leads to the formation of two spinel-like phases of nickel ferrite and copper chromite. A solid solution of nickel-copper ferrite-chromite was formed in the absence of a mineralizer. It was found that at heat-treatment...