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. 2023 May 26;9(6):e16601. doi: 10.1016/j.heliyon.2023.e16601

Fig. 7.

Fig. 7

The synthesis of spinel ferrite and transition metals-substituted spinel ferrite nanoparticles via sol-gel technique [87], b) CuFe2O4 via sol-gel combustion method [61], c) ZnFe2O4 NPs via sol-gel method [93].