Fig. 3

FE-SEM images of NiCoFe₂O₄ nanostructures (a), EDX spectrum of non-calcined NiCoFe₂O₄ nanoflowers (b-d), and SEM micrographs of the non-calcined nanoflowers, (e), EDX spectrum of the calcined nanoflowers at 400 °C (f), and SEM micrographs of the calcined nanoflowers at 400 °C