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The influence of substitutions on structural,magnetic and dielectric responses in the mixed D1-xAxFe2O4 (D = Mn,Co,Ni,Cu; A = Zn,Mg; x = 0.0,0.5) ferrites as synthesized by chemical co-precipitation method have been presented.X-ray diffraction pattern confirms that the mixed ferrite samples are in cubic inverse spinel structure,which is further validated by Rietveld refinement.